Question

the length of two sides of a triangle are 12cm and 15 cm .between what two measures should the length of the third side

Answer 1

Answer:

If the triangle is right angled triangle then

Let,

triangle ABC,

other sides = AB&BC.

AB=12, BC=?=x

Hypoteneous= BC.

BC=15

Now,

In triangle ,angle B= 90°

${12}^{2} + {x}^{2} = {15}^{2}$

$144 + {x}^{2} = 225$

${x}^{2} = 225 - 144$

${x}^{2} = 81$

$x = \sqrt{81}$

$x = + 9$

$or \: x = - 9$