Question

14. If the perimeter of a semi-circular protractor is 72 cm, find the radius of the protractor.


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Answer 1

So, the perimeter of the semicircular protractor is πr. Hence, the radius of the circle is 14 cm.

Answer 2

$\orange\longrightarrow$ᴘᴇʀɪᴍᴇᴛᴇʀ ᴏғ sᴇᴍɪᴄɪʀᴄᴜʟᴀʀ ᴘʀᴏᴛʀᴀᴄᴛᴏʀ = 72 ᴄᴍ

ᴛʜɪs ɢɪᴠᴇs

πʀ + 2ʀ = 72

ʀ(π + 2) = 72

ʀ(22 + 14)/7 = 72

ʀ(36)/7 = 72

ʀ = 72 x 7 / 36

• ʀ = 14 ᴄᴍ