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Question


In the given figure, a semicircle is drawn on the hypotenuse of the right-angled triangle. Another arc of radius 30 cm is drawn passing through A and C with O as the center. What is the area of the shaded region? (Take π as 3.14 and 3 = 1.732)

A
117.75 sq cm
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B
216 sq cm
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C
271.95 sq cm
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D
108 sq cm
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Solution

The correct option is C 271.95 sq cm

Area of the shaded region = Area of semicircle APC - Area of segment AQC
Area of semicircle = πr22=3.14×15×152=353.25sqcm
Area of segment = Area of sector OAQC - Area of triangle OAC
Consider triangle OAC
Since all sides are equal to 30 cm in the triangle, it is an equilateral triangle.
Hence, each angle is equal to 60 degrees.
Hence OAC=AOC=ACO=60.
Now, let the height be h.
sin60=h30
32=h30
h=153
Now, area of triangle OAC is 12×base×h
=12×30×153=2253sq.cm=389.7sq.cm
Area of the sector OAQC = 60360×π×r2=16×3.14×30×30=471sq.cm.
Hence, area of segment AQC = 471 - 389.7 = 81.3 sq cm
Hence, area of the shaded region = Area of semicircle - area of segment AQC
= 353.25 - 81.3 = 271.95 sq cm.

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