ML Aggarwal Solutions Class 10 Mathematics Solutions for Mensuration Exercise 17.2 in Chapter 17 - Mensuration

Question 28 Mensuration Exercise 17.2

A semi-circular lamina of radius 35 cm is folded so that the two bounding radii are joined together to form a cone.

Find the (lateral) surface area of the cone.



The overall area a cone occupies in a three-dimensional space is referred to as its total surface area. It is equivalent to the total of the cone's curved surface and base.

M L Aggarwal - Understanding ICSE Mathematics - Class 10 chapter Mensuration Question 28 Solution image

Curved surface area of the cone =π r1l

= (22/7)×17.5×35

= 22×17.5×5

= 1925 cm2

Hence the lateral surface area of the cone is 1925 cm2.

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