example 1 draw conclusions in the diagram, ab bc. what can you conclude about 1 and 2 ? solution...
DESCRIPTION
GUIDED PRACTICE for Examples 1 and 2 Given that ABC ABD, what can you conclude about 3 and 4 ? Explain how you know. 1. They are complementary. Sample Answer: ABD is a right angle since 2 lines intersect to form a linear pair of congruent angles (Theorem 3.8 ), 3 and 4 are complementary. ANSWERTRANSCRIPT
EXAMPLE 1 Draw Conclusions
In the diagram, AB BC. What can you conclude about 1 and 2?
SOLUTION
AB and BC are perpendicular, so by Theorem 3.9, they form four right angles. You can conclude that 1 and 2 are right angles, so 1 2.
EXAMPLE 2 Prove Theorem 3.10
Prove that if two sides of two adjacentacute angles are perpendicular, then theangles are complementary.
Given ED EF
Prove 7 and 8 are complementary.
GUIDED PRACTICE for Examples 1 and 2
Given that ABC ABD, what can you conclude about 3 and 4? Explain how you know.
1.
They are complementary.Sample Answer: ABD is a right angle since 2 linesintersect to form a linear pair of congruent angles (Theorem 3.8), 3 and 4 are complementary.
ANSWER