Math, asked by vikky156, 11 months ago

step by step with formula plz

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Answered by abhi569

Answer:

Required curved surface of the cone is 275 cm^2.

Step-by-step-explantion:

Length of arc = 2 x ( 22 / 7 ) x 15 x ( 140° / 360° ) { using arc = 2πr( ∅ / 360° ) }

Thus length of arc is 110 / 3 cm .

When folding the sector once, arc becomes the circumference of the base of that cone.

= > 2π x radius of base of cone = 110 / 3

= > radius of base of cone = 110/3 x 7/44 = 35 / 6 cm

Therefore curved surface of the cone is :

= > π x ( 35 / 6 cm ) x 15 cm

= > 22 / 7 x ( 35 / 6 cm ) x 15 cm

= > 275 cm^2

Hence the required curved surface of the cone is 275 cm^2.

Answered by krishna02299

Answer:

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