Calculate the area of triangle ABC.
Note: Drag the blue points to try different figures.

Find the equation of the line that represents the base of the triangle.

Find the equation of the line that represents the height of the triangle.

Find the point of intersection of the line representing the height and the line representing the base of the triangle.

Calculate the length of the base of the triangle.

Calculate the length of the height from point B to the point of intersection.

Calculate the area of triangle ABC.

This applet is provided by Walch Education as supplemental material for their mathematics programs. Visit www.walch.com for more information on their resources.