Question

3. The diameter of a coin is 4.2 cm. Find its
surface area.
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Answer 1

Answer:31.86

Explanation:area of circle=PY

Answer 2

Diameter of a coin = 4.2

Radius                     =4.2 upon 2 = 2.1 cm

A                              = pie r square

                                = 22/7 x 2.1 x 2.1

                                = 22 x 6.3

                                = 13.86 cm^2