Area of triangles worksheets
Finding the area of triangles with the formula area = ½ × base × height.
Download the free area of triangles worksheet (PDF)
Area of triangles worksheet
What’s on the worksheet
- 50 questions on area of triangles, sized for US Letter paper
- 4 pages of questions plus an answer key on the last page
- Written for grade 6, matching Common Core 6.G.A.1
- Name and date lines at the top, and room to show the work
Sample questions from this worksheet
- A triangle has a base of 12 cm and a height of 6 cm. Find its area.
- A triangle has a base of 14 cm and a height of 6 cm. Find its area.
- A triangle has a base of 14 cm and a height of 11 cm. Find its area.
- A triangle has a base of 5 cm and a height of 2 cm. Find its area.
- A triangle has a base of 12 cm and a height of 2 cm. Find its area.
- A triangle has a base of 2 cm and a height of 12 cm. Find its area.
Preview the worksheet and answer key
Make a new area of triangles worksheet
Need another page for extra practice, a retake or a second group in class? The free Mathify Kids test maker builds a fresh area of triangles worksheet with different numbers every time. Choose Core, Standard or Challenge level, print it with its own answer key, or let your child take it on screen and see the score straight away.
Area of triangles: a worked example (A triangle with base 10 cm and height 6 cm)
- Area = ½ × base × height.
- 10 × 6 = 60.
- Half of 60 is 30, so the area is 30 cm².
How to use it at home and in class
At home
Draw a rectangle around the triangle to see why it is half of base × height. Ten problems a day works better than a whole sheet at once. Mark them together with the answer key, then ask your child to explain one they got wrong: finding the mistake themselves is where the learning happens.
In class
Use the first row as a warm-up, a full page for independent practice, or five questions as an exit ticket. For a retake or a second group, make a new version with the test maker so every child gets different numbers.
Mistakes to watch for
- Using a slanted side as the height instead of the straight-up height.
- Forgetting to halve.
What to practice before and after area of triangles
- Before: area of rectangles. If this sheet is a struggle, go back a step.
- After: volume of rectangular prisms, once this one is mostly right.
- Learn it first: the area of triangles lesson and the perimeter and area chart.
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Questions parents ask
Why do you divide by 2 for a triangle?
A triangle is exactly half of a rectangle with the same base and height.
What grade is this area of triangles worksheet for?
It is written for grade 6 and matches Common Core standard 6.G.A.1.
Can I get a different version of this area of triangles worksheet?
Yes. Use the free Mathify Kids test maker to make a new area of triangles worksheet with different numbers every time, at Core, Standard or Challenge level, with its own answer key.