Question

the diameter of a circle is 8.4 cm .find the area of sector of the length of the arc is 2.8 pi cm.​

Answer 1

Step-by-step explanation:

As we know that,

Area of circle =πr

2

Whereas r is the radius of circle.

Diameter of circle =8.4m(Given)

Radius of circle =

2

8.4

=4.2m

Therefore,

Area of the circle =

7

22

×4.2×4.2

=22×4.2×0.6=55.44m

2

Answer 2

Answer:

• 18.48 cm².

Step-by-step explanation:

Given :

Diameter of circle = 8.4 cm

Length of arc = 2.8 π

To find :

Area of sector.

Solution :

• Area of sector of circle:

⇒ 1/2 × Length of arc × Radius of circle

⇒ 1/2 × 2.8π × 8.4/2

⇒ 1/2 × 2.8π × 4.2

⇒ 2.1 × 2.8π

⇒ 2.1 × 2.8 × 22/7

⇒ 5.88 × 22/7

⇒ 18.48 cm²

∴ The area of sector is 18.48 cm².