volume_mute
If all measurements are in centimetres, the area of the figure below is:
publish date: 2020/11/06 22:46:00 GMT+11
volume_muteUnit of measurement is cm2
50.73
99.82
80.18
90
119.45
Correct Answer
80.18
Explanation
This is a rectangle shape and three halves of circles. Two halves are taken away from the rectangle area and one half is added to the rectangle area. These half-circles are all the same in area.
In other words
Area = rectangle area - half circle + half circle - half circle
Two half circles cancel each other
Area = rectangle area - half circle
Rectangle area = 6 * 15 = 90 cm2
half circle = (π * 2.52 ) / 2 = 9.8125 cm2
Area = 90 - 9.8125 = 80.18 cm2