Area of a Triangle Worksheet
Find the area of each triangle from its base and height. Some triangles are obtuse, so the height falls outside the triangle — a classic sticking point.
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- No AI — answers are calculated, not guessed
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Example worksheets
Made with this tool — click any example to see it full size.
Best for: Grades 5–6
Half of base times height
Area = ½ × base × height. A triangle is exactly half of a rectangle with the same base and height.
The height is perpendicular
The height is the straight-up distance from the base to the top corner, shown as a dashed line with a right-angle mark — not the slanted side.
Make it a timed challenge
Put a visual classroom timer on the board and see how many problems students can finish before the time runs out. Print a new version tomorrow and try to beat the score.
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Frequently asked questions
Which units are used?
Problems mix cm, in, m and ft, and answers are in square units.
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