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Evaluate Without Using a Calculator by Using Ratios in a Reference

Question 521

Multiple Choice

Evaluate without using a calculator by using ratios in a reference triangle.
- $\sec 30 ^ { \circ }$

A) $\frac { \sqrt { 3 } } { 2 }$
B) $\sqrt { 2 }$
C) $\frac { 2 \sqrt { 3 } } { 3 }$
D) 2

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