Question

The diameter of a semi circular protractor is 7 cm. Find its perimeter.
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Answer 1

Answer. =22 cm sq................

Answer 2

Answer:

17.99 or 18

Step-by-step explanation:

$\large\bf\red{Circle}$

The plane round figure have a point in the center of it and the measure of round is same from that point is called as circle.

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$\large\bf\red{Semi\;Circle}$

The half of circle or cutting of circle on diameter line is called semi circle.

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$\large\bf\red{Diameter}$

The straight line passing from the center point of a circle is called as diameter.

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$\large\bf\red{Perimeter}$

The distance from around of 2 dimensional shape is called as perimeter

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$\large\bf\red{Given}$

Diameter of a semi circle = 7cm

π = 3.14 or 22/7

Perimeter = ?

We know tha perimeter of semi circle is πr+d or

For using the formula semi circle = πr+d , we need to find r.

We Know that r = d/2

r = 7/2

r = 3.5

$\large\bf\red{Taking\;pi=3.14}$

perimeter of semi circle is πr

Perimeter of semi circle = 3.14 × r + d

Perimeter of semi circle = 3.14 × 3.5 + 7

Perimeter of semi circle = 17.99

$\large\bf\red{Perimeter\; of\; semi\; circle = 17.99}$

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$\large\bf\red{Taking\;pi=22/7}$

perimeter of semi circle is πr+d

Perimeter of semi circle = 22/7 × r + d

Perimeter of semi circle = 22/7 × 3.5 + 7

Perimeter of semi circle = 18

$\large\bf\red{Perimeter\; of\; semi\; circle = 18}$