Practice Quiz

SAT Math

Category - Geometry and Measurement

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What is the perimeter of a square whose area is 8?
  1. 4
  2. 4√2
  3. 8
  4. 8√2
  5. 16
Explanation
Answer: D - The perimeter of a square is 8√2. Use the formulas for area A=a^2 and perimeter P=4a of a square.
A=a^2⟺8=a^2⟹a=√8=√(4×2)=2√2
P=4a=4×2√2=8√2
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