Question

Perimeter of a semi circular protector is 66cm its diameter is....

Answer 1

The diameter of he protractor is 25.67 cm.

Step-by-step explanation:

The perimeter of a semi circle, also known as the circumference of the semi circle is,

$C=\pi r+2r$

It is provided that:

C = 66 cm

Compute the value of r as follows:

$C=\pi r+2r\\66=r(\pi +2)\\66=r[\frac{22}{7}+2]\\66=r\times \frac{36}{7}\\r=\frac{66\times7}{36}\\r=12.83$

Compute the diameter of the semi circle as follows:

Diameter = 2 × r = 2 × 12.83 = 25.67 cm

Thus, the diameter of he protractor is 25.67 cm.

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