Question

Find the area of an annulus of inner and outer radii 4 cm and 10 cm respectively

Answer 1

Answer:

area of the circle is 22/7×r^2

area of inner radius is 22/7×4×4=50. 2cmsquare

area of outer radius is 23/7×10×10=314. 2cmsquare

Answer 2

The area of annulus is 264 cm²

Step-by-step explanation:

Let R be the outer radius and r be the inner radius of the annulus.

So, we have

R = 10 cm

r = 4 cm

The area of an annulus is given by

$A=\pi(R^2-r^2)$

Substituting the values of R and r in this formula

$A=\pi(10^2-4^2)\\\\A=\frac{22}{7}(100-16)\\\\A=\frac{22}{7}\cdot84\\\\A=264\text{ cm}^2$

Therefore, the area of annulus is 264 cm²

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Area of circular ring

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