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GeomBench
Rectangle and triangle area, side by side.
Any triangle sharing a base and height with a rectangle covers exactly half that rectangle's area — that's why the triangle formula (½·base·height) is literally the rectangle formula divided by two.
Seeing both formulas together makes the relationship between them concrete instead of abstract, which helps when you're estimating material for a gable roof section or a triangular garden bed next to a rectangular one.
Rectangle area (w × h)
60
What you entered
Rectangle area
10 × 6= 60Triangle area (same base & height)
½ × 10 × 6= 30Result
Rectangle area (w × h): 60
With width 10 and height 6, the rectangle area (60) is exactly double the triangle area (30) — a triangle is always half of the rectangle sharing its base and height.