Answer:
[tex]\frac{\sqrt{2} }{2\\}[/tex]
Step-by-step explanation:
A triangle has a total of 180° (B is a 90° angle)
Take 180° - 90° to find the angle of A + C which equals 90°
take 90°/2 to get the angle of C which is 45°
and to check that take 45°+45°+90°= 180°
Now...
cos (C)
cos(45°) = [tex]\frac{\sqrt{2} }{2}[/tex] [Answer]
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