The answer is 14 because you just have to pick a number to work with so it is 14.
Given:
Base length of triangle = 10 units
Height of triangle =
units
Length of hypotenuse of triangle = 12 units
To find:
Exact value of Cos A
Steps:
The cosine of any angle is equal to the length of the adjacent side by the length of the hypotenuse side.
So,
Cos A = 
Cos A = 
Cos A = 0.833
Therefore, the exact value of cos A is 0.833.
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The 3 sides should obey the Pythagorean Theorem
29^2 = 21^2 + 18^2
29^2 does not equal 441 + 324 = 765
29^2 = 841
Answer: B
Step-by-step explanation: