RRB Group D Model Paper 1 with solutions

Question : 28 of 100

Marks: +1, -0

Find the difference between the areas of circles having radius 12 cm and 5 cm.

Solution:

(4) The difference between the areas of circles having radius 12 cm and 5 cm = π

(r_1 ^2 – r_2^ 2)

22/ 7 (12^2 – 5^2)

= 374

cm^2

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