alleryवर्तुळाकार वलयाची मर्यादा 21 सेंमी. आनी 14 सेंमी. ताचें क्षेत्रफळ सोदून काडात (pi = 22/7).
A1078 cm²
B770 cm²
C308 cm²
D462 cm²
Answer & Solution
Correct answer: B. 770 cm²
रिंग क्षेत्रफळ pi (21 वर्ग उणे 14 वर्ग) = (22/7)(245) = 770 चौरस सेंमी.
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