alleryਇੱਕ ਗੋਲਾਕਾਰ ਰਿੰਗ 21 cm ਅਰਧ ਵਿਆਸ ਅਤੇ 14 cm ਦੇ ਚੱਕਰਾਂ ਨਾਲ ਘਿਰਿਆ ਹੋਇਆ ਹੈ। ਇਸਦਾ ਖੇਤਰਫਲ ਪਤਾ ਕਰੋ (pi = 22/7)।
A1078 cm²
B770 cm²
C308 cm²
D462 cm²
Answer & Solution
Correct answer: B. 770 cm²
ਰਿੰਗ ਖੇਤਰਫਲ ਪਾਈ ਹੈ (21 ਵਰਗ ਘਟਾਓ 14 ਵਰਗ) = (22/7)(245) = 770 ਵਰਗ ਸੈਂਟੀਮੀਟਰ।
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