Question

ABC is right-angled at A. If AB = 9 cm, AC = 12 cm, then find the length of BC.
1115​

Answer 1

Answer:

315 is your correct ans.

Answer 2

Step-by-step explanation:

Given :

ABC is th right angle∆ at A ,

AB= 9cm,

AC=12cm,

To find:

Length of BC i.e. hypotenuse....

Solution:

We know that ABC is a right angle∆ ,

Therefore by using Pythagoras theorem

(BC)²= (AB)²+(AC)²

= (9)²+ (12)²

= 81 + 144

= 225

(BC)²= 225

NOW,

Taking square root ,

(BC)²= 225

BC= 15 ......

Therefore, BC= 15