Angles Proofs

Given: ∠1 and ∠2 are supplementary. What can you conclude?

• Nothing

What does it mean to bisect a segment or an angle?

• Split it into 3 equal parts.

• Split it into 2 equal parts.

• Split into 4 equal parts.

• Double it.

In the given proof, what are the reasons for step 1 and 2?

• Angles that form a linear pair are supplementary.

• Substitution

• Reflexive Property of Congruence

• Angles of equal measure are congruent.

In the given proof, what is the statement for step 2?

Identify the  missing statement or reason

• Given

• Vertical Angles Theorem

• Definition of Angle Bisector

• Alternate Interior Angles Theorem

Name the property.
If A is in the interior of <BDC, then m<BDA + m<ADC = m<BDC. 

• Reflexive

• Transitive

• Segment Addition Postulate

• Angle Addition Postulate

Find the value of x.

If m∠RST = (12x -1)°, m∠RSU = (9x -15)°,

and m∠UST = 53°, find m∠RSU.

x = ______

The definition of a linear pair includes

(select all that apply)

• Two angles share a vertex

• Two angles make a straight angle

• The sum of the measures of a linear pair are 180*

• Two angles that are complementary angles