1)The diameter of a circle is 19 m. Find the circumference to the nearest tenth
The equation to find the circumference for a circle is C=2πR or C = πD. The diameter is equal to 2r so that is why the equation works either way. Now we will plug in the numbers. C =19π. This is approximately equal to 59.6902604182 which is approximately equal to 59.7
2)AND the diameter of a circle is 3ft. Find its area to the nearest tenth.
As stated before the diameter is equal to 2r. The area of a circle is calculated using the equation πr^2. First we need to find the radius which is 1/2D. 3/2 = r or 1.5 = r. Now we can plug all values in. A = π1.5^2 which equals to 2.25π which equals to 7.06858347058 which is approximately 7.1.
