allery7 cm ત્રિજ્યા અને 5 cm ઊંચાઈ ધરાવતા એક ડ્રમની વક્રસપાટીનું ક્ષેત્રફળ કેટલું થાય? (pi = 22/7)
A154 sq cm
B440 sq cm
C110 sq cm
D220 sq cm
Answer & Solution
Correct answer: D. 220 sq cm
વક્રસપાટીનું ક્ષેત્રફળ 2 pi r h = 2 x 22/7 x 7 x 5 = 220 ચોરસ સેન્ટીમીટર થાય છે.
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