Hello, its.all.up.2.u!

Prove:Code:B * *| * c * | * a * |h * * | * * | * A * * * * * * * C b

We know that the area is: . .[1]

The base of the triangle is side .[2]

In the right triangle at the left: . .[3]

Substitute [2] and [3] into [1]:

. . .