Multiple choice

If a wire of length 36 cm. is bend in a shape of semi circle then find the area of the semi circle. (in cm2) यदि 36 सेमी. लम्बाई वाले तार को मोड़कर अर्द्धवृत्त का आकार दिया जाये तो अर्द्धवृत्त का क्षेत्रफल ज्ञात कीजिए। (सेमी.2 में)

  1. 77 cm2/सेमी2

  2. 72 cm2/सेमी2

  3. 82 cm2/सेमी2

  4. 144 cm2/सेमी2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Semi-circle perimeter includes half-circumference + diameter. Using π = 22/7: perimeter = πr + 2r = 36, so (22/7)r + 2r = 36 → r(22/7 + 2) = 36 → r = 7. Area = (πr²)/2 = (22/7 × 49)/2 = 77 cm². The claimed answer is correct assuming π = 22/7.

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