Table of Contents
What is R 12cm?
r = 12 cm. C = 2πr. = 2 × 12 × 3.14. = 24 × 3.14. = 75.36 cm^2.
What is the formula of area of the circle?
Area of a circle can be calculated by using the formulas: Area = π × r2, where ‘r’ is the radius. Area = (π/4) × d2, where ‘d’ is the diameter. Area = C2/4π, where ‘C’ is the circumference.
What is the circle of diameter 12 cm?
So, if d=12 cm, r=12(12)=122=6 cm.
What is the area when the radius is 12?
The area of the circle is 452 .
What is the circumference of a 16cm circle?
50.27 in
16π≈50.27 in.
Why area of circle is pir2?
The usual definition of pi is the ratio of the circumference of a circle to its diameter, so that the circumference of a circle is pi times the diameter, or 2 pi times the radius. This give a geometric justification that the area of a circle really is “pi r squared”.
What is the area of 8cm by 4cm?
=32cm²(ans.)
What is the formula for determining the area of a circle?
Area of a circle formula. The formula for the area of a circle is π x radius 2, but the diameter of the circle is d = 2 x r 2, so another way to write it is π x (diameter / 2) 2.
How do you measure the area of a circle?
The area of a circle is the amount of space the circle covers. The formula for calculating the area of a circle is A = π_r_ 2 where pi (π) equals 3.14 and the radius ( r) is half the diameter.
What is the area of a circle when the radius is 12?
So if the radius of the circle is 12″, then the area “A” is (approximately) 3.14 * 12^2 or about 3.14 * 144 = 452.16 square inches. If the diameter of the circle is 12″, then the radius is 6″ (half the diameter), and the area “A” is (approximately) 3.14 * 6^2 or about 113.04 sq. in.
What is the formula for finding the diameter of a circle?
If you know the area of the circle, divide the result by π and find its square root to get the radius; then multiply by 2 to get the diameter. This goes back to manipulating the formula for finding the area of a circle, A = πr 2, to get the diameter. You can transform this into r = √(A/π) cm.