Question

The diameter of a semicircular protractor is 7 cm. Find its perimeter.

Answer 1

Heya mate, Here is ur answer

Given :The object is protractor

Diameter=7 cm

Radius =7/2 cm

Perimeter of protractor=Perimeter of circle /2 + diameter

Why diameter ❓❓

Because Protractor doesn't only has semicircle, but also the base boundary=diameter

Perimeter of protractor=
$\pi \: r + 2r$

$= r(\pi+2)$

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

$= \frac{7}{2} \times \frac{22+14}{7}$

$= \frac{7}{2}×\frac{36}{7}$

So, perimeter of protractor=18 cm

Warm regards

@Laughterqueen

◦•●◉✿[Tʜᴀɴᴋ ʏᴏᴜ]✿◉●•◦

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Answer 2

Solutions :-


Given :

Diameter of semicircular protractor = 7 cm


To find :

Perimeter of semicircular protractor.



Find the perimeter of semicircular protractor :-

Perimeter of semicircle $= \frac{1}{2} (\pi \times d) + d \: \: \: \: unit \\ \\ = \frac{1}{2} ( \frac{22}{7} \times 7) + 7 \: cm \\ \\ = \frac{1}{2} (22) + 7 \: cm \\ \\ = 11 + 7 \: cm\\ \\ = 18 \: cm$


Hence,
Perimeter of semicircular protractor is 18 cm