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If the diameter of a semi-circular protractor is then find its perimeter.

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answer is A.

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Detailed Solution

Concept: We are given the diameter of the protractor (semi-circle) . We have to find the perimeter of the protractor. Apply the formula,

. Here, radius (

) will be the half of the diameter.
Given that,
Diameter of the protractor

As we know that, radius is the half of the diameter of circle or semi- circle
Therefore, Radius of the circle

Now, using

The perimeter of the given semi- circular protractor is

.
Hence, the correct answer is option 1) 36 cm

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