Test
Area of triangles, parallelograms and trapezoids
Dynamic tasks on finding areas, bases and heights of triangles, parallelograms and trapezoids.
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Sample questions
- A triangle has base ___ cm and corresponding height ___ cm. Calculate its area.
- A triangle has area ___ cm² and base ___ cm. Find the corresponding height.
- A parallelogram has base ___ cm and height ___ cm. Calculate its area.
- A parallelogram has area ___ cm² and height ___ cm. Find its base length.
- A trapezoid has bases ___ cm and ___ cm and height ___ cm. Calculate its area.
Area of triangles, parallelograms and trapezoids
A triangle has A = ah/2, a parallelogram A = ah and a trapezoid A = (a + b)h/2. The height must be perpendicular to the selected base.
Unknown dimensions
Rearrange the formula to find a base or height from a known area. In a trapezoid, a and b are the parallel sides only. Convert units before calculating and express area in square units.
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