A triangle with a trapezoid in front to the left
page5-63.png page5-145.png page7-36.png
page1-10.png page2-111.png page1-186.png page5-145.png page5-63.png page8-165.png page5-235.png page5-215.png page7-36.png page3-174.png
Very good now choose the three triangles on top of a triangle those three triangles are in a straight line horizontally