Question

caculate x.In the diagram. ​

Answer 1

Answer:

18 is the correct answer

Step-by-step explanation:

using Pythagoras theorem ,

let one part of x be o

o²=15²-12²

o²=225-144

o²=81

o=√81

o=9

when line from vertex falls on base it divides in two equal parts.

x=9+9

=18

Answer 2

Answer:

If it's a right angle triangle

let's name the triangle ABC and a line passing through A be D

In triangle ABD

by Pythagoras theorem

(BD)^2 = (AB)^2 - (AD)^2

(BD)^2 = 225 - 144

BD = 9

In triangle ACD

(CD)^2 = (AC)^2 - (AD)^2

(CD)^2 = 225 - 144

CD = 9

BC= BD+CD

BC = 9+9

BC = 18 cm