if the height of a closed cone is 7 times the radius of it's base find t.s.a
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Answer:
r=3cm
h=7r
=7*3=21cm
l=√h²+r²
=√21²+3²
=√441+9
=√450
=21.21cm
T.S.A of cone=πr(l + r)
=π 3(21.21+3)
=π 72.63cm
=72.63πcm²
Step-by-step explanation:
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