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 centimetre.​

Answer 1

Answer:

Area of circle =πr ^2

Whereas r is the radius of circle.

Diameter of circle =8.4m(Given)

$radius \: of \: the \: circle \: = \frac{8.4}{2} = 4.2$

$\: therefore \: \\ area \: of \: the \: circle \: = \frac{22}{7} \times 4.2 \times 4.2$

$= 22 \times 4.2 \times 0.6 = {55.44}^{2}$

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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.