Teaching Jharkhand (JSSC) PRT (1 to 5) Mock Test 2023 Quantitative Aptitude Mensuration Solid Figures

एक वृत्त की त्रिज्या 40% कम कर दी जाती है। उसका क्षेत्रफल कितने प्रतिशत कम हो जाएगा?

1
40%
2
64%
3
78.4%
4
65%
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