Transcript

INSTRUCTOR:

Step one, draw a rectangle. The area is a times b, which is length times width.

Step two, draw a line from one corner to the opposite side to make a triangle. Step three, cut out the triangle.

Step four, move the triangle to the other side to make a parallelogram. Area equals a times b, which is base times height of the parallelogram.

Step one, draw a parallelogram. Area equals base times height.

Step two, draw one of its diagonals. Step three, cuts along the diagonal.

Check the resulting two triangles are the same by placing one over the other. The area of one triangle is 1/2 the base times the height.