what is the area of a circle with a diameter of 10 millimeters? Estimate the area to the tenths place using 3.14 or /pi.
a. 78.5 square mm
b. 15.7 square mm
c. 79 square mm
d. 314 square mm
b. 15.7 square mm
To find the area of a circle, you use the formula A = πr^2, where r is the radius of the circle and π is approximately 3.14.
Since the diameter is given as 10 mm, the radius is half of that, which is 5 mm.
Plugging in the values, we get A = 3.14 * (5)^2 = 3.14 * 25 = 78.5 square mm.
Rounded to the tenths place, the estimated area is 78.5 square mm.