Question

If the diameter of a circle is 8 cm then find it’s area and circumference.

Answer 1

Answer:

$\huge \mathcal \orange{Given:-}$

Diameter of a circle = 8 cm.

$\huge \orange{Find:-}$

1. Area of circle.
2. Circumference of circle.

$\pink{First, \: We \: can \: find \: radius \: of \: the \: Circle:}$

$r = \frac{d}{2}$

$= \frac{8}{2}$

$= 4$

So,

$\blue{Radius \: of \: Circle \: = 4 \: cm}$

$\large\mathcal \red{1. \: Area \: of \: Circle:}$

$= \pi {r}^{2}$

$= \frac{22}{7} \times {(4)}^{2}$

$= \frac{22}{7} \times 16$

$= 50.27 \: {cm}^{2}$

$\large\mathcal\red{2. \: Circumference \: of \: the \: Circle:}$

$= 2\pi r$

$= 2 \times \frac{22}{7} \times 4$

$= 25.13 \: cm$

Answer 2

Answer:

The area of a circle is 50.29 cm square.

The circumference of a circle is 25.14 cm.

Step-by-step explanation:

If the radius of a circle is r .

Then the area of a circle is $\pi$$r^{2}$.

Then the circumference of a circle is 2$\pi r$.

So , here diameter of the circle is 8 cm .

So , the radius of the circle is (8/2)cm = 4 cm.

Then the area of a circle is $\pi$$r^{2}$ = (22/7) * 4 * 4 = 50.29 cm square.

Then the circumference of a circle is 2$\pi r$ = 2 * (22/7) * 4 = 25.14 cm.

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