There is a right triangle ABC with , , and Use a calculator to find cos A . Round your answer to the nearest hundredth.
A)0.87
B)0.86
C)0.48
D)0.49
E)0.85

Question

There is a right triangle ABC with  ,  , and   Use a calculator to find cos A . Round your answer to the nearest hundredth. ​
A)0.87 
B)0.86 
C)0.48 
D)0.49 
E)0.85

Quizplus · Accepted Answer

To find cos A, we need to find the ratio of the adjacent side to the hypotenuse. Using the Pythagorean Theorem, we can find that the hypotenuse is √(11²+11²)=11√2. The adjacent side to angle A is 11, so cos A = 11/(11√2) = √2/2 ≈ 0.87 (rounded to the nearest hundredth). Therefore, the best choice is A.

There Is a Right Triangle ABC with