Answer:
B is true
Step-by-step explanation:
ratio of all corresponding sides are equal
It's C the missing side is 9 units long so since cosine is adjacent divided by hypotenuse it would be 9/41
Here's a tip Subtracting a fraction is the same as multiplying it's reciprocal so for 3/4 - 3/8 you can do 3/4 x 8/3. Multiplying its reciprocal mean turn the 2nd fraction around