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Find the total surface area of …

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Find the total surface area of cone radius 3cm height 4cm

Posted by Pinky Jain 5 years ago

CBSE > Class 09 > Mathematics

2 answers

Indhu Indhu 5 years ago

r=3 cm and h=4 cm Let l be the slant height of the cone. Then, l2=r2+h2 l2=32+42 l=5 cm Therefore, Area of the curved surface = πrl=722×3×5=47.14 cm2

1Thank You

Gaurav Seth 5 years ago

the formula to find total surface area of cone is
πr(r+l)
to find l use l²=r²+h²

∴l²=3²+4²
=9+16
=25
∴l=5cm

now using π r ( r + l )
3.14 *3(3+5)
3.14 *3(8)
9.42*8
75.36 cm²

3Thank You

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