1. which theorm explains why the circumcenter is equidistant from the vertices of a triangle? a. vertical angles theorem b. concurrency of perpendicular bisectors theorem c. concurrency of angle bisector theorem d. alternate interior angels theorem 2. if the circumcenter of a triangle lies on the triangle, then what type of triangle is it? a. acute b. right c. obtuse d. equilateral

Part A:

Option B - Concurrency of Perpendicular Bisectors Theorem is the correct answer.

Concurrency of Perpendicular Bisectors Theorem states that the perpendicular bisectors of the sides of a triangle intersect in a point that is equidistant from the vertices.

Part B:

Option B- right triangle is correct.

A right-angled triangle is a triangle which have one right angle. A triangle is acute if the circumcenter lies inside the triangle and it is obtuse if the circumcenter lies outside the triangle and right if the circumcenter lies on the triangle.

answer: 7 x 2/5 = 2.8 hours, is your answer. your welcome! : 3

step-by-step explanation: first work out how long it took to hose 1/7 of the lawn which is 2/5 hours. times that by 7 to get the whole lawn.

sorry i don't know the other answer. i didn't learn what a proportional relationship is.