5. Find the ratio of T.S.A. of ballon whose radius
increase 6 cm to 12 cm
Answers
Answered by
1
Step-by-step explanation:
Total surface area of a Hemisphere =2πr
2
+πr
2
=3πr
2
r=6,Surface area=3π(6)
2
=36
r=12,Surface area=3π(12)
2
=144
Ratio = 36:144
=1:4
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