Question

23. An hour glass is made using
identical double glass cones of
diameter 10 cm each. If total
height is 24 cm, then find the
surface area of the glass used in
making it.
CBSE 2015, 14​

Answer 1

Surface area of the glass used in  making hour glass = 565.2 cm²  where hour glass is made using  identical double glass cones of  diameter 10 cm each and total height = 24 cm

Step-by-step explanation:

Diameter of cone = 10 cm

Radius of cone = 10/2 = 5 cm

Total Height = 24 cm

Height of 1 cone = 24/2 = 12 cm

Lateral Height = √5² + 12² = 13 cm

Surface Area of one cone = πr² + πrL

= π( 5² + 5*13)

= 90π

Surface Area of 2 cones = 2 * 90π

= 180π

using π = 3.14

= 565.2 cm²

surface area of the glass used in  making hour glass = 565.2 cm²

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Answer 2

Step-by-step explanation:

hope this helps you all