Question

Find the perimeter of a protractor of diameter 14cm.


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Answer 1

Step-by-step explanation:

Diameter of the semicircular protractor = 14 cm

Radius = 14/2 cm = 7 cm

Perimeter of semicircle = πr + d

Perimeter of semicircular protractor = 22/7 x 7 + 14 = 22 + 14

= 36 cm

The perimeter of the semicircular protractor is 36 cm.

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Answer 2

$radius = \frac{14}{2} = 7 \: cm$

$\frac{1}{2} (2\pi \: r) \\ = > \frac{1}{2} \times 2 \times \frac{22}{7} \times 7 \\ = > 22 \: cm$