Question

The area of a circular plate is 77.5 cm, what is diameter of the plate?
(a) 5 cm. (b) 6 cm ( 7 cm. (d) 8 cm​

Answer 1

Answer:

answer is 9.928cm

Step-by-step explanation:

answer is 9.929cm

Answer 2

The diameter of the plate(d) = 9.92 cm

Step-by-step explanation:

Given,

The area of a circular plate = 77.5 $cm^2$

To find, the diameter of the plate(d) = ?

Let the radius of a circular plate = r

We know that,

The area of a circe $=\pi r^{2}$

⇒$\dfrac{22}{7}\times r^{2$= 77.5

⇒ $r^{2}=\dfrac{77.5\times 7}{22}$

⇒ $r^{2}$ = 24.64

⇒ r = 4.96 cm

The radius of a circular plate(r) = 4.96 cm

∴ The diameter of the plate(d) = 2 × 4.96 cm

= 9.92 cm

There is no option matched.

Thus, the diameter of the plate(d) = 9.92 cm