Area of Triangles with Geoboard

A triangle is a polygon with three sides. The height of a triangle is a perpendicular line segment from one side to an opposite vertex. If you made a flipped copy of the triangle, you could put the two triangles together to form a parallelogram. The parallelogram has a base equal to the base of one triangle and height equal to the height of one triangle. Recall that the area of a parallelogram is A = b × h. Since it takes two identical triangles to make a parallelogram, the area of a triangle is A = ½(b × h), or A = ½bh.

Area of Triangles using the Brainingcamp Geoboard virtual manipulative.

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Brainingcamp virtual manipulatives can be used anywhere with no setup, cleanup, or lost parts. They are highly effective at engaging today’s digital learners and helping them bringing abstract math concepts to life.


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