1. ) Are two right angles supplementary? Why?
   Yes, because theyr sum is 90°+90°=180°

2. ) How many right angles do we have? Why?
   We have 2: 90° and 270°. Because in both cases the lines are perpendicular between each other, creating a right angle.

3. ) If ∠A and ∠B are congruent and complementary, what is the measure of ∠A? Why?
   45° because A+B=90° (complementary condition) and A=B (congruent condition)

4. ) What is the measure of ∠C if it is a linear pair of 80°?
   10° because linear pairs are supplementary.

5. ) If two angles are complementary but one angle is twice as large as its pair, what are the measures of these angles?
   30° and 60°. Complementary condition: A+B=90°; pair condition: B+2B=180°.

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