MA, Stanford University
Teaching in the San Francisco Bay Area
Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts
You can imagine that a right triangle is half of a rectangle, or a non-right triangle is half of a parallelogram. Hence, the area of a triangle is 1/2 the are of a rectangle or parallelogram- or1/2 base times height. You can also imagine making a sandwich and cutting it into two triangles- the area is 1/2 base times height, and, as always, the perimeter is the sum of all of the outsides.
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