Prove that if the two arms of an angle are parallel to the two arms of another angle, then the angles are either equal or supplementary.

If one angle of a triangle is equal to the sum of the other two angles, then the triangle is

Is it true to say that, if in two triangles, an angle of one triangle is equal to an angle of another triangle and two sides of one triangle are proportional to the two sides of the other triangle, then the triangles are similar? Give reason for your answer.

If two angles and a side of one triangles are equal to two angles and a side of another triangles , the triangles are congruent.

Define supplementary angles.

In a parallelogram, two adjacent angles are supplementary.

Theorem 6.4 : If a transversal intersects two parallel lines, then each pair of interior angles on the same side of the transversal is supplementary.

If two sides and an angle of one triangle are equal to two sides and an angle of another triangle , then the two triangles must be congruent’. Is the statement true? Why?

If two sides and an angle of one triangle are equal to two sides and an angle of another triangle , then the two triangles must be congruent’. Is the statement true? Why?

Prove that consecutive angles ofa parallelogram are supplementary.

A pair of supplementary angles is