Question

the circumference of a circle is 31.4 cm . find the radius and the area of the circle? [take \pi=3.14]

Answer 1

circumference of circle = 2πr
31.4=2×3.14×r
31.4=6.28r
r=31.4÷6.28
r=5cm
area of circle=πr²
area=3.14×5×5
area= 78.5cm²

Answer 2

The radius and the area of the circle is 5 cm and 78.5 sq.cm respectively.

Step-by-step explanation:

Circumference of circle = $2 \pi r$

We are given that the circumference of a circle is 31.4 cm .

So,  $2 \pi r=31.4$

$2 \times 3.14 \times r=31.4$

$r=\frac{31.4}{2 \times 3.14}$

$r=5$

Area of circle = $\pi r^2$

Area of circle = $3.14 \times 5^2$

Area of circle = $78.5 cm^2$

Hence the radius and the area of the circle is 5 cm and 78.5 sq.cm respectively.

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The circumference of a circle is 31.4 .find the radius and the area of the circle ?​