Find the area of a triangle two sides of which are 18cm and 10cm and the perimeter is 42cm

Class 9  Exercise 12.1  Question 4 find the area of a triangle two sides of which are 18cm and 10cm and the perimeter is  42cm .  Solution:  Let and be the sides of the triangle  ABC. Here we have perimeter of the triangle    , and . First we will find the 3rd side of the triangle  by using perimeter,  then we will use  Heron’s formula  to find the area of the  given triangle. The Heron’s formula  for finding the area of a triangle  given by Area of a triangle =    where , and are the sides of the triangle …

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