(b) A triangle PQR, where PQ = 9 cm, QR = 12 cm and PR = 15 cm, is rotate about the side QR totrace out a cone. Find the volume and the total surface area of the cone.
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Answer:
answer is 108
Step-by-step explanation:
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Answered by
0
Answer:
Step-by-step explanation:
Volume = 1/3 π r² h
= 1 /3 π (12)² * 9
= 432 π
Total surface area = πr² + πrh
= π [(12)² + 12*9]
= 252π
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