Question

The diameter of a semi-circular protractor is 7 cm. Find perimeter​

Answer 1

Answer:

Perimeter of semi circle - πr + 2r

Radius - 7/2 = 3.5

22/7*3.5 + 2*3.5

11 + 7

= 18

Answer 2

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The diameter of a semi-circular protractor is 7 cm. Find perimeter​.

${\large{\underbrace{\underline{\bf{Answer:-}}}}}$

Diameter = 7 cm

Radius = $\frac{7}{2}$ cm

Perimeter of protactor = $\frac{Perimeter \: of \: circle}{2}$ + diameter

                                      $= \pi r + 2r\\= r( \pi + 2)\\\\= \frac{7}{2} (\frac{22}{7} + 2)$

                                       $= \frac{7}{2} \: × \: \frac{22 + 14}{7}$

∴ Perimeter of protactor = 18 cm

Hope this helps uh! ♡