SAT Math Multiple Choice Question 243: Answer and Explanation

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Test Information

Question: 243

3.

In the figure shown, ΔABC ∼ ΔDBE. What is the length of

  • A. 3.5
  • B. 3.75
  • C. 4
  • D. 4.5

Correct Answer: C

Explanation:

C

Difficulty: Easy

Category: Additional Topics in Math / Geometry

Strategic Advice: Corresponding sides of similar triangles are proportional, so write a proportion (paying careful attention to the order of the sides) using the sides that you know and the side that you're looking for. Then, solve the proportion for the missing side.

Getting to the Answer: Call the missing side x. Write a proportion using words first, and then fill in the lengths of the sides that you know:

The length of is 4.

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