Geometry and Trigonometry practice question

Answer: A. √2/2

In an isosceles right triangle with legs 1, the hypotenuse is √2, so cos 45° = 1/√2 = √2/2.

Why the other answers are wrong

B. 1/2

1/2 is cos 60°.

C. √3/2

√3/2 is cos 30°.

D. 1

1 is cos 0°.

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