1. Which Biconditional is not a good definition? A: Two angles are supplementary if and only if the sum of their angles measures 180
B: Two angles are vertical angles only if they are not adjacent to each other are formed by two intersecting lines
C: Two angles form a linear pair if and only if the angles are adjacent
D: The sum of two angles if 90 is and only if those two angles are complementary

D

Step-by-step explanation:

the sum of two angles if 90 is and only if those two angles are complementary

correct answer is option b.

step-by-step explanation:

the true statement about geometric figure is option b that is one line can be drawn through all three points.

if three points are on the same plane, they can be connected by a line.

proofs involving isosceles triangles often require special consideration because an isosceles triangle has several distinct properties that do not apply to normal triangles.(more about triangle types) therefore, when you are trying to prove that two triangles are congruent, and one or both triangles, are isosceles you have a few theorems that you can use to make your life easier.

step-by-step explanation:

an isosceles triangle has two congruent sides and two congruent angles. the congruent angles are called the base angles and the other angle is known as the vertex angle. ∠bac and ∠bca are the base angles of the triangle picture on the left. the vertex angle is ∠abc