what is the area of a circle with a diameter of 10 millimeters? Estimate the area to the tenths place using 3.14 for pie
1. 15.7 square mm.
2. 79 square mm.
3. 78.5 square mm.
4. 314 square mm.
The correct answer is 3. 78.5 square mm.
To find the area of a circle, you can use the formula A = πr^2, where A is the area and r is the radius. Since the diameter is given, you can find the radius by dividing it by 2.
In this case, the diameter is 10 mm, so the radius is 10 mm / 2 = 5 mm.
Now, you can substitute this value into the area formula:
A = 3.14 * (5 mm)^2 = 3.14 * 25 mm^2 = 78.5 mm^2.
Therefore, the estimated area, rounded to the tenths place, is 78.5 square mm.