Let me see if I can help... First let's split the shape into two rectangles. Use the formula V = lwh or V = Bh .... To find the volume of the bottom rectangle we multiply... V = (4*2) x 1 This gets us 8 in³. To find the volume of the top triangle we multiply... V = (2*1) x 2 This gets us 4 in³. Now just add 8 + 4 and you will get 12 in³. Hope this helps you. (If you need any more explanation I'm happy to help you.)