volume_mute

If all measurements are in centimetres, the shaded area of the figure below is:

publish date: 2020/11/07 06:59:00 GMT+11

volume_mute

Unit of measurement is cm2

complex-shape-3.jpg

3.93
11.52
388.77
141.11
129.59

Correct Answer

129.59

Explanation

The shaded area can be calculated using the following idea

Area = Big sector area - small sector area      (where big sector is for angle 330o)

Let's do it using every formula

Area          = 330/360 * π * 72 - 330/360 * π * 22 = 129.59

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