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ASVAB · Geometry

A rectangle has a length of 12 inches and a width of 5 inches. What is its perimeter?

Correct answer

34 inches

  1. A 60 inches
  2. B 34 inches
  3. C 17 inches
  4. D 24 inches

Why this is the answer

PERIMETER of a rectangle = 2 × (length + width) = 2 × (12 + 5) = 2 × 17 = 34 inches. ASVAB Mathematics Knowledge tests perimeter vs area. Strategy: PERIMETER is the distance around (add all sides; for a rectangle, 2L + 2W); AREA is the space inside (L × W = 60 sq in here). COMMON ERROR: confusing perimeter with area — perimeter uses addition of sides and is in linear units (inches); area uses multiplication and squared units. The perimeter here is 34 inches (12+5+12+5).
Source: ASVAB Mathematics Knowledge — Rectangle Perimeter

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