find the volume of a cone whose radius 7cm and height 21cm.also find its tsa
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Answer:
V=πr2h
3=π·72·21
3≈1077.56628cm
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Answered by
0
Answer
1077.56628cm³
Step-by-step explanation:
V=πr2h
3=π·72·21
3≈1077.56628cm³
r=7 cm
height=h=21 cm
so l=√7²+21²
=√49+441
=√490-7√10cm
so total surface area=(1+r)
=(22/7)x7x(7√10+7)
=22×(7-√10+7)
=22x7x(√10+1)
=154(3.16+1)
=154×4.16
=640.64cm²
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