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QuestionHow do I find the area of a circle?DonaganTop AnswererMultiply pi by the square of the radius.
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QuestionShould I follow PEMDAS in the formula?DonaganTop AnswererYes, PEMDAS has to be used because of the exponentiation, you have to do that first. If you rewrite it as π×r×r/2 then you don't have to worry about PEMDAS, because it involves only multiplication and division.
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QuestionWhat is the area of a semicircle with the radius of 1.4 m?Community AnswerGiven a radius of circle = 1.4m. As we know, the area of semicircle=((pie)*r*r)/2=(3.14*1.4*1.4)/(2)=3.078 m square.
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QuestionHow do you find the radius of a semicircle when you have the perimeter?Community AnswerThis question uses the concept of circumference rather than area, so be sure to read about calculating the circumference of a circle. To find the radius from the perimeter, you need to know that the perimeter (also called "circumference" when talking about a full circle) of a full circle is given by 2*pi*r. Since we need the perimeter of a semicircle instead of a full circle, divide this by 2 (since the arc length is half) but then add the diameter, which is two times the radius (to account for the straight part across the bottom). So, perimeter of semicircle = (2*pi*r)/2 + 2r = (2 + pi)r. Solve for r = perimeter / (2 + pi), and you have your radius!
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QuestionWhy do we need to divide it by 2?DonaganTop AnswererBecause "semi" means "half."
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QuestionWhat is the perimeter if the semicircle's diameter is 12cm?DonaganTop AnswererIf you're asking about the circumference of a semicircle (the length of the arc), a full circle's circumference is pi multiplied by the diameter, so a semicircle's circumference would be half that.
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QuestionIf the area of a semicircle is 25.12 square meters, what is the diameter?Community AnswerFirst multiply the area by 2. Then divide by pi. Then take the square root. Then double that number and you get the diameter in meters.
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QuestionWhat if there is no number given, and I'm supposed to just find the area of the circle without any clue?DonaganTop AnswererIf you don't know the radius, diameter, or circumference, you can't find the area.
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QuestionWhat is the area of half a semi circle?Community AnswerThe area of a circle is πr², where r is the radius of the circle. The area of half the semicircle is one-quarter of that.
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QuestionHow do I find the total perimeter of an object that measures 3cm, 5cm, 7cm, 2cm, 10cm and 7cm?LyKaxandra CaimoyCommunity AnswerIf the values you gave are the measurements of the sides, you just need to add them.
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QuestionHow do I find the diameter of a circle?Community AnswerThe diameter is twice the radius. It's also the circumference divided by pi.
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QuestionHow do I find the radius given the arc length?DonaganTop AnswererIf you're referring to a semicircle, double the arc length, then divide by twice pi (π x 2).
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QuestionHow do I find the length of an arc if I know the radius and the height?Community AnswerTo find the diameter, multiply the radius by two and you should get the diameter and that is the length.
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QuestionIf the perimeter of semicircle park is 72 m, how do I find its area and radius?DonaganTop AnswererAssuming the "perimeter" consists of only the curved side of the park, the circumference of the full circle would be 144. Divide that by pi to get a diameter of 45.84. The radius is half the diameter, or 22.92 m. The area is πr², or 1,650.36 square meters.
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QuestionHow do I find the radius when I only have the length of the arc?DonaganTop AnswererYou double the arc, then divide by pi to get the diameter, and divide again by 2 to get the radius. (It's quicker to divide the full-circle circumference by twice pi, or 6.28.)
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QuestionWhat is the area of the semicircle if it has a diameter of 12 pi?DonaganTop AnswererThe radius would be 6π, so the area of the full circle would be π(6π)² = 36π³, and the area of the semicircle would be 18π³.
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QuestionHow do I find the radius without knowing the area?Community AnswerTo find the radius, you just need to know the diameter of the semicircle. The area is not needed.
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QuestionWhat is the formula for the area of a semicircle in terms of its diameter?Community AnswerFor the area of a semicircle we use the formula: (π * r^2) / 2 for a given radius r. Because the diameter is half the radius, we can make the conversion r = d / 2, which gives us the following: (π * (d / 2)^2) / 2, which when simplified will give us (π * d^2) / 8. Therefore the formula for the area of a semicircle in terms of its diameter is (π * d^2) / 8 for diameter d.
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QuestionHow do I find the area of a semicircle with a diameter of 55 cm?Community AnswerThe formula for area of a semicircle is πr²/2. π55²/2 = π3025/2 = 9498.5/2 = 4749.25 cm.
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QuestionFind the area of a semicircle when its diameter is 2.6m?DonaganTop AnswererThe radius is 1.3 m. Square that, multiply by pi, then divide by 2.
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QuestionHow can I get the area for a semi circle in a simplified way?DonaganTop AnswererFind the area of the full circle (πr²) and divide by 2.
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QuestionFind the approximate area of a semicircle with a radius of 6 centimeters. Hint: remember a semicircle is 1/2 of a circle.DonaganTop AnswererArea of a semicircle = πr² / 2 = (3.14)(36) / 2 = 56.52 square centimeters.
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QuestionDo we still use the formula for radius (2 times pi times radius)?DonaganTop AnswererThat is the formula for the circumference of a circle.
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QuestionWhat is the volume of a cylinder?DonaganTop AnswererV = πr²h, where r is the radius and h is the height or length of the cylinder.
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QuestionHow do I find the area of 1/4 of a circle or 3/4 of a circle?DonaganTop AnswererYou would need to know the radius of the circle. Then using A=πr², find the area of the full circle. Divide that by 4 to find the area of 1/4 of the circle. Then multiply that by 3 to find the area of 3/4 of the circle.
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QuestionFind the area of a semi-circle with diameter ‘d’ cm?DonaganTop AnswererIf the diameter is d, the radius is d/2. The area of the semicircle is (πr²) / 2 = [(π)(d/2)²] / 2 = [(π)(d²/4)] / 2.
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QuestionFind the area of a semicircular shape that is 28 cm. Pi is 22/7?DonaganTop AnswererIf we assume the 28 cm refers to the radius, then the area of the semicircle is [(π)(r²)] / 2 = [22/7)(28)²] / 2 = 1,232 square centimeters.
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QuestionI have a semicircular backyard filled with grass, and I plan to build a circular patio in it. How many square metres of grass will I cut if the radius is 3 metres?DonaganTop AnswererYou would need to know two radii, one for the semicircle and one for the circle. You'd then calculate the two areas and subtract the circle's area from the semicircle's area.
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QuestionHow do I find the perimeter of a semicircle if I only have the radius?DonaganTop AnswererDouble the radius to get the diameter. Multiply by pi to get the circumference of the full circle. Divide by 2 to get the circumference of the semicircle.
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QuestionHow to find a area of a semicircle given radius of 56 pi = 22/7?DonaganTop AnswererIf r = 56, A = (πr²) / 2 = [(22/7)(3136)] / 2 = 4928.
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