Question

How do you find the length side of c of a right triangle if side a = 15 and side b = 20?

Answer 1

Use the Pythagoras Theorem:

`c^2 = b^2 + a^2 with a = 15 and b = 20`
`c^2 = 225 + 400 = 625 -> c = 25.`

Another shortcut way is use the ratio 3: 4: 5
Length sides: 15: 20: 25