If a triangle has side lengths 6, 8, and 10, what is its perimeter?

If a triangle has side lengths 6, 8, and 10, what is its perimeter?

• A. 14
• B. 12
• C. 22
• D. 24

Answer: (D)

Perimeter is the total distance around a shape, so for a triangle you add all three side lengths. Add 6, 8, and 10 to get 6 + 8 + 10 = 24. So the perimeter is 24. This 6-8-10 triangle is a multiple of the 3-4-5 right triangle, and the numbers satisfy the triangle inequality (6 + 8 > 10), so the measurement makes sense.

Perimeter is the total distance around a shape, so for a triangle you add all three side lengths. Add 6, 8, and 10 to get 6 + 8 + 10 = 24. So the perimeter is 24. This 6-8-10 triangle is a multiple of the 3-4-5 right triangle, and the numbers satisfy the triangle inequality (6 + 8 > 10), so the measurement makes sense.