The perimeter of a semi - circle is 25.7 cm. What is its diameter (in cm)? (π = 3.14)
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Correct answer: A
Explanation
The correct answer is option 1 i.e. 10
Let the radius of the perimeter be 'r' cm.
The perimeter of the semicircle = 2r + πr
⇒ 2r + πr = 25.7 cm.
⇒ 2r + 3.14r = 25.7
⇒ r = 25.7/5.14
⇒ r = 5
⇒ 2r = 10 cm.