Question

Find curved surface area of
frustrum having radii 4cm and 5cm.The slant height of frustrum is 7cm
​

Answer 1

Step-by-step explanation:

Given :-

• The radius of upper part,r = 4

• The radius of lower part,R = 5 cm

• The slant height of the frustum of cone,l= 7 cm

To Find :-

• Find curved surface area

Curved Surface Area of frustum of cone =

Curved Surface Area of frustum of cone =π(r1 +r2)l

= 22/7 (4+5)7

= 22/7×9×7

= 22 × 9

= 198 cm^2

• Hence the curved surface area is 198 cm^2

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