Question

What is the area of a circle having diameter 42 cm​

Answer 1

Answer:

A circle of radius = 21 or diameter = 42 or circumference = 131.9 cm has an area of: 1.385 × 10 -7 square kilometers (km²) 0.1385 square meters (m²) 1385 square centimeters (cm²)

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Answer 2

Answer:

$\\ r = \frac{d}{2} \\ r = \frac{42}{2} \\ r = 21 \\ area \: of \: circle \: = \pi {r}^{2} \\ = \frac{22}{7} \times 21 \times 21 \\ = 1386 {cm}^{2}$

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