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गोलक का क्षेत्रफल = 4 × π × (r)^2
प्रथम गोलक का क्षेत्रफल = 4×3.14×(21/2)^2
= 4×3.13×(10.5)^2
= 1384.74 cm^2
द्वितीय गोलक का क्षेत्रफल = 4×3.14×(17.5/2)^2
= 4×3.14×(8.75)^2
= 961.625 cm^2
दोनों गोलकों को बनाने में लगी धातु का अनुपात ,
= 1384.74/961.625
= 36/25
अनुपात = 36 : 25 अथवा 1.44 : 1
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36:25 is the answer...
please mark as the brailiest
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