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3 years ago

A circle with radius of 4 cm sits inside a circle with radius of 11 cm.

Mathematics

2 answers:

kap26 [50]3 years ago

5 0

The area of the shaded region = 330 sq cm

Step-by-step explanation:

Given,

The radius of small circle (r) = 4 cm

The radius of large circle (R) = 11 cm

To find the shaded region

Formula

The area of circle of radius r = π $r^{2}$ sq cm

So, The radius of the small circle = π× $4^{2}$ sq cm = 16π sq cm

The radius of the large circle = π× $11^{2}$ sq cm = 121π sq cm

Hence the area of the shaded region = 121π-16π sq cm

= 105π sq cm

= 105 × $\frac{22}{7}$ sq cm = 330 sq cm

o-na [289]3 years ago

3 0

Answer: 329.7

Step-by-step explanation:

Area of circle = \pir^{2}

Area of circle with radius of 4 cm = 3.14 * 4 * 4 = 50.24

Area of circle with radius of 11 cm = 3.14 * 11 * 11 = 379.94

Their difference = 329.7

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