Grade 6 FAST Mathematics Practice Test

Find the perimeter of a triangle with sides 5 cm, 7 cm, and 9 cm.

20 cm 21 cm 23 cm 26 cm

Correct Answer:

21 cm

Explanation:

Perimeter is the total length around the triangle, found by adding all three side lengths. For these sides, add 5 cm, 7 cm, and 9 cm: 5 + 7 = 12, and 12 + 9 = 21. So the perimeter is 21 cm. This checks out because you’re measuring the entire boundary once. If you mis-sum by skipping a side or counting a side twice, you’d get numbers like 20, 23, or 26, which aren’t the actual distance around the triangle.

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