a fez cap used by truck is shaped like frustum of cone if it's radius of open side is 10 cm ,R of upper base is 4 cm , slant height is 15 cm . find the area of material used for making?
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l=15 cm
R=10 cm
r=4 cm
Area of material used=Π*(r+R)*l+Πr²
=22/7*(10+4)*15+22/7*4*4
=22/7*14*15+22/7*16
=44*15+352/7
=660+50.285
=710.285 cm²
R=10 cm
r=4 cm
Area of material used=Π*(r+R)*l+Πr²
=22/7*(10+4)*15+22/7*4*4
=22/7*14*15+22/7*16
=44*15+352/7
=660+50.285
=710.285 cm²
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