Question

If the inner qnd outer diameter of an iron ring are 42 cm and 70cm respectively .find now how much square iron sheet is in the ring

Answer 1

iron sheet is in the ring is 66cm²

Step-by-step explanation:

diameter of inner circle=20cm

therefore radius=20/2=10cm

diameter of outer circle=22cm

therefore radius=22/2=11cm

area of inner circle=nr²

=22/7x10x10

=2200/7cm²

area of outer circle=nr²

=22/7x11x11

=2662/7

hence, area of the ring=2662-2200/7

=462/7

=66cm²

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