Find the area of a triangle two sides of which are 18 cm and 10 cm and the perimeter is 42 cm.
Solution:
Length of first side of triangle
cm
Length of second side of triangle
cm
Perimeter of triangle
cm
Length of third side of triangle =c=Perimeter of triangle-a-b
cm
Semi-perimeter of triangle
cm
Using Heron’s formula to find area of triangle, we get
Area of triangle
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