Which expression correctly gives the perimeter of a parallelogram with side lengths a and b?

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Multiple Choice

Which expression correctly gives the perimeter of a parallelogram with side lengths a and b?

Explanation:
Perimeter is the total distance around the shape, so you add all four sides. In a parallelogram opposite sides are equal, giving two sides of length a and two sides of length b. Add them: a + a + b + b = 2a + 2b. This is the perimeter expression. The other forms either subtract lengths, count only half the perimeter, or assume all sides are equal, which isn’t generally true unless a equals b.

Perimeter is the total distance around the shape, so you add all four sides. In a parallelogram opposite sides are equal, giving two sides of length a and two sides of length b. Add them: a + a + b + b = 2a + 2b. This is the perimeter expression. The other forms either subtract lengths, count only half the perimeter, or assume all sides are equal, which isn’t generally true unless a equals b.

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