I NEED TO GET A GOOD GRADE TO PASS GEOMETRY

Which type of construction is illustrated below?

A.

a perpendicular line

B.

angle subtraction

C.

a congruent angle

D.

an angle bisector

The number of revolutions of two pulleys is inversely proportional to their diameters. if a 24-inch diameter pulley making 400 revolutions per minute is belted to an 8-inch diameter pulley, find the number of revolutions per minute of the smaller pulley.

What dimensions can créate more than one triangle ?

Consider the set of all four-digit positive integers less than 2000 whose digits have a sum of 24. what is the median of this set of integers?