The diameter of a circle is 8 centimeters. What is the area?
51.12cm
52.42cm
54.40cm
50.24cm
Explanation:
8 cm = 2 × radius
8 cm × 2 = radius
radius = 4 cm
Area= $\pi$ × r2
= $\pi$ × 42
= $\pi$ × (4 × 4)
Area = 50.24 cm
Next Question
Length of a side of a square field is 275 m. What will be cost of levelling the field at a rate of 10 cent per square metre?