Answer:
12.29 cm
Explanation:
You want the side adjacent to the 35° angle in a right triangle with hypotenuse 15 cm.
Cosine
The trig relation of interest is ...
Cos = Adjacent/Hypotenuse
cos(35°) = x/(15 cm)
Multiplying by 15 cm gives ...
x = (15 cm)·cos(35°)
x ≈ 12.29 cm
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