Question

If the perimeter of a semicircular protractor is 66cm find the radius of protector

Answer 1

the perimeter is 66

$\frac{1}{2} 2 \times \pi \times r \\ \frac{22}{7} \times r = 66 \\ r = 66 \times \frac{7}{22} \\ r = 21 \: cm \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: |hope \: it \: will \: help \: you| \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: |thank \: you|$

Answer 2

The radius of protector is 12.84 cm

Step-by-step explanation:

Perimeter of  semi circular Protector = $\pi r +2r$

Where r is the radius

We are given that the perimeter of semi circular protractor is 66cm

So,$\pi r+2r = 66$

$3.14r+2r=66\\r(3.14 +2)=66\\5.14r=66\\r=\frac{66}{5.14}\\r=12.84$

Hence The radius of protector is 12.84 cm

#Learn more:

Find perimeter and area of semicircle. diameter of. semicircle = 12

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