a.
Which means that the two angles are congruent.
Reason: Given
b.
Which means that the measure of angle QPS is equal to the measure of angle TPR.
Reason: Congruent angles
The measure of congruent angles are equal.
c.
It means that the sum of angle QPR and angle RPS equals angle QPS.
Reason: Angle Addition Postulate
When we have two adjacent angles the measure of the angle containing the two angles equals the sum of the measure of the two angles.
d.
Substituting equation b into the equation c;
So, we have;
Reason: Substitution
e.
since we now have two equations for angle TPR in d above. we can now equate the two equations;
Reason: Equating and subtraction
We equate two expressions of the same angle and subtract angle RPS from both sides.
f.
Reason: Congruent Angles.
Since the measure of angle QPR is equal to the measure of angle TPS ( as shown in e above) then the two angles are congruent.
Proved!