Answer:
The angle measurement of a is 21.78°.
Step-by-step explanation:
Given : The triangle abc has a side lengths ac=13 and the hypotenuse ab=14.
To find : Whats the angle measurement of a ?
Solution :
In triangle abc,
The side length is the adjacent side of the angles a i.e. base = ac=13
The hypotenuse is ab=14.
Apply trigonometry in triangle abc,





Therefore, the angle measurement of a is 21.78°.
64 = 63 + 1 = 7*9 + 1, so taken modulo 9, 64 is equivalent to <em>x</em> = 1.
I think it is 15, just by looking at it