Can someone PLEASEEEE help with this and dont forget the step by step solution i wanna LEARN how to do it

Right Triangle

Step-by-step explanation:

This triangle is right because it has a right angle and all the angles add up to 180°.

Volume = 126cm CUBED

Step-by-step explanation:

Lets start by cutting it into 3 spaces.

Lets cut a square at the bottom (6x6)

the triangle on the right (6*6)

and the rectangle in the middle. (6*12)

6*6+6*6*1/2+6*12 = x

36 + 18 + 72 = x

54 + 72 = x

x = 126cm cubed