Question

The circumference of circle is 42cm. Find the radius of the circle and area of the circle.​

Answer 1

Answer:

Radius = 6.7cm

Area = 141cm²

Step-by-step explanation:

circumference = 2πr=42

πr= 21

r= 21/π

r= 6.7cm

Area = πr² = π x 6.7x 6.7= 141cm²

Answer 2

Answer:

$the \: circumference \: of \: the \: circle = 42 \: cm \\ 2\pi \: r = 42 \\ \pi \: r = 21 \\ = > \pi = \frac{22}{7} \\ \frac{22}{7} (r) = 21 \\ r = \frac{21 \times 7}{22} \\ r = \frac{147}{22}$

r = 6.681 cm

area of circle = πr²

=22/7 × (1.681)²

=2.827 cm²

Step-by-step explanation:

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