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

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Multiple Choice

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

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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