Given the diagram below, what is cos(45)?

A) cos(45) =.

Step-by-step explanation:

Given : A triangle 90 - 45-45 with perpendicular side 9.

To find : what is cos(45)?

Solution : We have given that triangle 90 - 45-45 with perpendicular side 9.

By the triangle 90 - 45-45 rule : adjacent side is same as opposite side and hypotenuse is √2 times of adjacent side.

Then adjacent side = 9

Hypotenuse = 9 .

Then cos(45) = .

cos(45) =  

cos(45) =

Therefore, A) cos(45) = .

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step-by-step explanation: