Question

A triangle has an area of 36 square units. Its height is 9 units.

What is the length of its base?

__ units

Answer 1

`The\ area\ of\ the\ triangle:A_\Delta=(b\cdot h)/(2)\\----------------------\\A_\Delta=36\ u^2;\ h=9\ u\\\\subtitate\ to\ formula\ of\ the\ area\ of\ a\ triangle:\\\\36=(b\cdot9)/(2)\to(9b)/(2)=36\ \ \ \ |multiply\ both\ sides\ by\ 2\\\\9b=72\ \ \ \ |divide\ both\ sides\ by\ 9\\\\\boxed{b=8\ (u)}`