Check the picture below.
for "b", well, recall that the sum of all interior angles in a triangle is 180°.
for "a", "c" and "d", well, all those are just <u>intercepted arcs</u>.
Answer:
46.6
Step-by-step explanation:

68% you have to divide 17 by 25 and then move the decimal
It is the division property because x or 1x is dividing the 10