1.

Find the area of circular ring whose external and attitude diameter are 20 cm and 6 CM​

Answer»

ANSWER:

AREA of circular ring = 286 sq cm

Step-by-step explanation:

area of square = π * r ki POWER 2

                          EXTERNAL diameter = 20 cm

                           r1 = 10 cm

internal diameter = 6 cm  so r2 = 3 cm

area of circular ring = area of external diameter - area of attitude

=  π * 10 * 10 -  π * 3*3

= π(100-9)

=91 π sq cm

or 22/7 * 91 = 286 sq cm

                                     



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