Area of a Triangle
Two identical triangles make a parallelogram: area = base × height ÷ 2
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One triangle is awkward to measure — but two identical triangles join into a parallelogram. The parallelogram is twice the triangle, so the triangle’s area = base × height ÷ 2. Tap “Rotate & join” to watch the second triangle make a half-turn and lock in, revealing where the ÷2 comes from.
Tap “Rotate & join”: a second identical triangle turns a half-turn and joins the first into a parallelogram. The parallelogram is twice the triangle, so the triangle's area is base × height ÷ 2.