Question

please help me in question no. 3 ex 13.2 ( class 9 maths )​

Answer 1

Answer:

Inner radius of cylindrical pipe = ₁ =

Inner diameter

2

cm = 2 cm

Height (h) of cylindrical pipe = 77 cm

Curved Surface Area of inner surface of pipe=2rr₂h

-(2x²x2x77) cm²

= 968 cm²

Answer 2

Answer:

answer is above

Step-by-step explanation:

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