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LESSON 2: Pairs of Angles and Relationships Between Angles
LESSON 1 Congruent Angles
Consider the two angles below. What can you say about their measur
ABC-75 and 2 PQR = 75%.
mc ABC m. PQR
Then you can say that they are congruent.
in symbols.
ABCPQR
(The symbol a is used to denote congruent
If two angles are congruent, then they have the same measureme
LESSON 2 Complementary and Supplementary Angles
Consider the two angles below. If you add their measurements who
Ruma
in symbols. mz ABCDEF-90
If the sum of the two angles is equal to 90%, then the angles are compl
Again, consider another pair of angles below. If you add their meas
what is the sum?
In symbol, mc PQR+ m STU=180
If the sum of the two angles is equal to 180°, then the angles are supp