Two Sides of a Right Triangle ABC (C Is the Right

question 29

Multiple Choice

Two sides of a right triangle ABC (C is the right angle) are given. Find the indicated trigonometric function of the given
angle. Give exact answers with rational denominators.
-Find $\cos \mathrm { A }$ when $\mathrm { a } = \sqrt { 13 }$ and $\mathrm { c } = 10$ .

• A) \(\frac { 13 } { 10 }\)
• B) \(\frac { \sqrt { 87 } } { 10 }\)
• C) \(\frac { 87 } { 13 }\)
• D) \(\frac { \sqrt { 13 } } { 10 }\)

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