Question

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

Answer 1

hope it will help you dear

Answer 2

P=42cm
3rd side=42-28
=14cm
S=P/2
42/2
21cm
Area of the triangle using herons formula
=√s(s-a)(s-b)(s-c)
=√21×3×11×7
=√7×3×3×7×11
=21√11 sq. cm