14. Find the area of a triangle two sides of which are 18 cm & 10 cm and the perimeter is 42 cm
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perimeter of triangle = 42cm
18cm + 10cm +c =42cm
c+28cm = 42
c= 42-28 = 14
side c = 14cm
area of triangle = 1/2 ×b ×h
= 1/2 ×18 × 14
= 1×9×14
=126cm
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