The question is related to trigonometric ratio rule .
In the given diagram, there is a right angle triangle, with adjacent =57, and the unknown side is y. Given angle measurement is 39 .
To find the measurement of y, we will use tan rule which is
y = 57 tan 39 = 46.2
The answer is 20, since it’s heads and tails you have a half and half chance, therefore you divide 40 in half and get 20
180 degrees. in an equilateral triangle, each angle is 60 degrees
Sec x is equal to 1/cosx, cot x is equal to cosx/sinx. cos x cancels, and you are left with 1/sinx. this is equal to cscx. Cosecant is : hypotenuse / opposite, so the answer is **D**
