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Earn +20 ptsQ: What is 2 x pi x r?
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What is the diameter of a 160 feet circle?
If circumference = 160', and circumference = 2 x pi x r, then... 160 = 2 x pi x r 80 = pi x r 80/pi = r 2(80/pi) = diameter = 50.99'
What is the formula for finding the circumference of a semicircle?
2 pi r = circumference. 1/2 of that is pi x r. pi is 3.142
What is the area of a circle that is 120 ft in circumference?
Circumference of circle = 2 x pi x r where r is the radius. So we have here 120 = 2 x pi x r or 60 = pi x r or 60 = 3.1415 x r, Hence r = 60/3.1415 = 19.099 Area of circle is pi x r x r, here it is 3.1415 x 19.099 x 19.099 = 1145.93 square feet
What is the formula using pi for the circumference and area of a circle?
Circumference: C = 2 x pi x r Area: A = pi x r2 Where: pi = about 3.1416, r is the radius (half the diameter).
The formula for the circumference of a circle is what?
Circumference of a circle = diameter*pi or 2*pi*radius
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