alleryગોળાકાર વોશરની ત્રિજ્યા 7 cm અને 3.5 cm હોય છે; તેના મેટલ વિસ્તાર? π = 22/7.
A154 cm²
B115.5 cm²
C192.5 cm²
D38.5 cm²
Answer & Solution
Correct answer: B. 115.5 cm²
ધાતુનો વિસ્તાર (22/7) × (7² − 3.5²) = 115.5 cm² છે.
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