Vocabulary Does an altitude of a triangle have to lie inside the triangle? Explain.
Writing How can you show that a parallelogram and a rectangle with the same bases and heights have equal areas?
▱ABCDwhite parallelogram eh b c d is divided into two triangles along diagonal AC¯.eh c bar , . If you know the area of the parallelogram, how do you find the area of ΔABC?cap delta eh b c question mark