Question

find the circumference and area of a circle whose diameter is 7 metre​

Answer 1

Answer:

Step-by-step explanation:

Circumference of a circle = 2.pi.r

Given , diametre is 7m

Radius , r = d/2 = 7/2

Circumference = 2 * 22/7 *7/2 = 22cm

Area = pi.r^2

= 77/2 = 38.5 cm^2

:)

Answer 2

AnsWer :

• Area of circle = 38.5 m².
• Circumference of circle = 22 m.

Formula :

$\tt\dagger \: \: \: \: \: Area \: of \: Circle = \pi {r}^{2}.$

$\tt \dagger \: \: \: \: \: Circumference \: of \: Circle = 2 \pi r.$

Solution :

We have,

• Diameter = 7 m.
• Radius = 7/2 m => 3.5 m.

$\tt \mapsto Area \: of \: Circle = \pi {r}^{2}.$

$\tt \mapsto Area \: of \: Circle = \dfrac{22}{7} \times {3.5}^{2}.$

$\tt \mapsto Area \: of \: Circle = \dfrac{22}{7} \times 12.25.$

$\tt \mapsto Area \: of \: Circle = {22} \times \dfrac{1225}{100}$

$\tt \mapsto Area \: of \: Circle = 38.5 \: {m}^{2} .$

$\rule{200}3$

$\tt \mapsto Circumference \: of \: Circle = 2 \pi r.$

$\tt \mapsto Circumference \: of \: Circle = 2 \times \dfrac{22}{7} \times 3.5.$

$\tt \mapsto Circumference \: of \: Circle = 2 \times \dfrac{22}{7} \times \dfrac{35}{10}$

$\tt \mapsto Circumference \: of \: Circle = 22 \: m.$