Question

Given right triangle ABC with altitude BD drawn to hypotenuse AC. If AC = 20 and DC = 5, what is the length of BC? (Note: the figure is not drawn to scale.) ​

Answer 1

21.2 or 15 sqrt of 2 (PETHAGOREOM theorem)

Explanation:

a^2+b^2=c^2

20^2+5^2=C^2

400+25=C^2

450=C^2

sqrt 450=

15 sqrt of 2 or 21.2