Why is the area of a triangle half of base times height?

Two identical triangles fit together to make a rectangle with the same base and height, so one triangle is exactly half of that rectangle.

How do I print or save these worksheets as a PDF?

Click Print worksheet and choose your printer, or pick “Save as PDF” as the destination to keep a digital copy. The answer key prints on its own page.

Can I get a fresh set of problems?

Yes. Click New problems for a brand new randomly generated worksheet, as many times as you like.

Is this worksheet generator free?

Yes. Every generator on the site is free to use, with no account, no watermark and unlimited printing for classroom or home use.

Area of a triangle worksheet generator

Drill the ½ × base × height formula, then flip it around so students solve for a missing base or height from a known area.

Area of a Triangle

Name: Date:

1.
Triangle: base 40 cm, height 7 cm. Area?
2.
Triangle: base 22 cm, height 17 cm. Area?
3.
Triangle: base 22 cm, height 8 cm. Area?
4.
Triangle: base 6 cm, height 16 cm. Area?
5.
Triangle: base 40 cm, height 17 cm. Area?
6.
Triangle: base 20 cm, height 19 cm. Area?
7.
Triangle: base 36 cm, height 20 cm. Area?
8.
Triangle: base 26 cm, height 6 cm. Area?
9.
Triangle: base 20 cm, height 7 cm. Area?
10.
Triangle: base 32 cm, height 18 cm. Area?
11.
Triangle: base 28 cm, height 16 cm. Area?
12.
Triangle: base 32 cm, height 14 cm. Area?
13.
Triangle: base 20 cm, height 3 cm. Area?
14.
Triangle: base 16 cm, height 5 cm. Area?
15.
Triangle: base 32 cm, height 3 cm. Area?
16.
Triangle: base 14 cm, height 3 cm. Area?
17.
Triangle: base 26 cm, height 19 cm. Area?
18.
Triangle: base 16 cm, height 6 cm. Area?
19.
Triangle: base 4 cm, height 14 cm. Area?
20.
Triangle: base 34 cm, height 2 cm. Area?

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Area of a Triangle — Answer Key

Name: Date:

1.
Triangle: base 40 cm, height 7 cm. Area?
140 cm²
2.
Triangle: base 22 cm, height 17 cm. Area?
187 cm²
3.
Triangle: base 22 cm, height 8 cm. Area?
88 cm²
4.
Triangle: base 6 cm, height 16 cm. Area?
48 cm²
5.
Triangle: base 40 cm, height 17 cm. Area?
340 cm²
6.
Triangle: base 20 cm, height 19 cm. Area?
190 cm²
7.
Triangle: base 36 cm, height 20 cm. Area?
360 cm²
8.
Triangle: base 26 cm, height 6 cm. Area?
78 cm²
9.
Triangle: base 20 cm, height 7 cm. Area?
70 cm²
10.
Triangle: base 32 cm, height 18 cm. Area?
288 cm²
11.
Triangle: base 28 cm, height 16 cm. Area?
224 cm²
12.
Triangle: base 32 cm, height 14 cm. Area?
224 cm²
13.
Triangle: base 20 cm, height 3 cm. Area?
30 cm²
14.
Triangle: base 16 cm, height 5 cm. Area?
40 cm²
15.
Triangle: base 32 cm, height 3 cm. Area?
48 cm²
16.
Triangle: base 14 cm, height 3 cm. Area?
21 cm²
17.
Triangle: base 26 cm, height 19 cm. Area?
247 cm²
18.
Triangle: base 16 cm, height 6 cm. Area?
48 cm²
19.
Triangle: base 4 cm, height 14 cm. Area?
28 cm²
20.
Triangle: base 34 cm, height 2 cm. Area?
34 cm²

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Frequently asked questions

Why is the area of a triangle half of base times height?: Two identical triangles fit together to make a rectangle with the same base and height, so one triangle is exactly half of that rectangle.
How do I print or save these worksheets as a PDF?: Click Print worksheet and choose your printer, or pick “Save as PDF” as the destination to keep a digital copy. The answer key prints on its own page.
Can I get a fresh set of problems?: Yes. Click New problems for a brand new randomly generated worksheet, as many times as you like.
Is this worksheet generator free?: Yes. Every generator on the site is free to use, with no account, no watermark and unlimited printing for classroom or home use.