From a circular disc of radius 28cm, two circles of radius 7/2 cm each, a triangle of base 3cm and height 2 cm, a rectangle of length 4 cm and breadth 3 cm are cut out. Find the area of the remaining disc.
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Total disc area =28 cm
Two circles radius =7/2=3.5cm
Area of circle =¶r2
=2(22/7×3.5×3.5)
=11 sq. cm
a triangle b=3cm
h=2cm
Area of triangle =1/2 bh
=1/2×3×2
=3 sq. cm
a rectangle l=4cm
b=3cm
Area of rectangle = l×b
=4×3
=12 sq. cm
Total cutted shape area = areas of circles + triangle + rectangle
= 11+3+12
=26sq.cm
Remaining shape area = total area - cutted area
=28-26
=2 sq.cm
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