Question

Small metallic washer is of 7 mm radius with a hole of 3.5 mm radius. What is the area of the washer?
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Answer 1

Small metallic washer is of 7 mm radius with a hole of 3.5 mm radius.

The area of the washer -

$A = \pi( {7}^{2} - {3.5}^{2} ) \\ A = \frac{22}{7} (49 - 12.25) \\ A = 115.5 \: {mm}^{2}$

Answer 2

Answer:

115.5

Step-by-step explanation:

AREA OF OUTER WASHER =πr.square

=22÷7×7×7

=154m

AREA OF INNER WASHER =22÷7×3.5×3.5

= 38.5

AREA OF WASHER = 154-38.5

=115.5