Question

The radius of a circle is 19 millimeters. What is the circle's area?
=19 mm

Answer 1

Area of a circle in terms of radius:
Area = π·r2 = 3.14·192 = 1134 square mm(*)
Area of a circle in terms of diameter:
Area = π·(d
2
)2 = 3.14·(38
2
)2 = 3.14·(19)2 = 1134 square mm(*)
Area of a circle in terms of circumference:
Area = C2
4π
= 119.42
4π
= 14256.36
(4·3.14)
= 14256.36
12.56
= 1134 square mm(*)