Question

How to calculate area&perimeter of a right-angled triangle? Thanks!

Answer 1

If the triangle is given as `Delta ABC` with the right angle by `C` we get
`A=(a*b)/2=(c*h_c)/2` and `u=(a+b+c)/2=s`

Explanation:

Where `h_c` is the hight on the side #c. We Can also write #
`u=(a+b+sqrt(a^2+b^2))/2`