The length of an angle is the reaction of the opposite leg length to the hypotenuse length

C

Step-by-step explanation:

we know that

In a right triangle

The cosine of an angle x is equal to

cos(x)=\frac{adjacent\ side\ angle\ x}{hypotenuse}

The sine of an angle x is equal to

sine(x)=\frac{opposite\ side\ angle\ x}{hypotenuse}

The tangent  of an angle x is equal to

tan(x)=\frac{opposite\ side\ angle\ x}{adjacent\ side\ angle\ x}

therefore

the answer is the option C

answer: i'm not going to give you the answer, but some hints to work it out.

step-by-step explanation: so, if there is a straight line that means that the line angle is 180°. so we subtract the 2 angle measures provided, (15 and 38) from 180. so the answer is 180 - (38 + 15). (you have to solve the equation)