Question

two sides of a triangle are 15cm and 16cm and its semi-perimeter is 20cm. find the third side of this triangle. Give explanation.​

Answer 1

Answer:

9 cm

Step-by-step explanation:

Perimeter is total of lengths of sides of triangle.

Semi-perimeter is half of the perimeter

As semi-perimeter is 20,

The perimeter will be 40

So, we have the equation

15 + 16 + 3rd side = 40

31 + 3rd side = 40

3rd side = 40-31 = 9 cm