alleryएक गोलाकार वॉशर की त्रिज्या 7 cm और 3.5 cm है; इसका धातु क्षेत्र? π = 22/7.
A154 cm²
B115.5 cm²
C192.5 cm²
D38.5 cm²
Answer & Solution
Correct answer: B. 115.5 cm²
धातु का क्षेत्रफल (22/7) × (7² − 3.5²) = 115.5 cm² है।
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