Mastering Geometry Proofs: Segments and Angles

This video tutorial covers how to write geometry proofs through three examples: line segments, supplementary angles, and the vertical angle theorem. The instructor explains each proof step-by-step, emphasizing understanding the problem, writing given statements, and applying rules to reach the proof's conclusion. The video concludes with a preview of future topics, including proofs with triangles and parallel lines.

What are the three types of examples covered in the video?

• Polygons, quadrilaterals, and angles

• Triangles, parallel lines, and circles

• Line segments, supplementary angles, and vertical angle theorem

• Congruent triangles, similar triangles, and circles

Tags

CCSS.8.G.A.2

What is the first step in writing a geometry proof?

• Write down the given statement

• Draw a diagram

• Apply the transitive property

• Identify the end goal

If B is the midpoint of segment AC, what can be said about segments AB and BC?

• They are congruent

• They are perpendicular

• They are parallel

• They are supplementary

Tags

CCSS.HSG.SRT.B.4

What postulate is used to state that AC equals AB plus BC?

• Linear Pair Postulate

• Transitive Property

• Segment Addition Postulate

• Vertical Angles Postulate

What is the final expression we are trying to prove in the line segment example?

• AC = 2 * AB

• AB = BC

• AC = AB + BC

• AB = AC / 2

Tags

CCSS.HSG.SRT.B.4

What does it mean for angles to be supplementary?

• They are adjacent

• They are congruent

• They are vertical angles

• Their measures add up to 180 degrees

Tags

CCSS.7.G.B.5

If angle 1 and angle 2 are supplementary, and angle 2 and angle 3 are supplementary, what can be said about angle 1 and angle 3?

• They are vertical angles

• They are complementary

• They are supplementary

• They are congruent

Tags

CCSS.7.G.B.5

What property allows us to set two equal sums to each other in the supplementary angles proof?

• Multiplication Property

• Substitution Property

• Transitive Property

• Addition Property

Tags

CCSS.7.G.B.5

What does the vertical angle theorem state?

• Vertical angles are adjacent

• Vertical angles are complementary

• Vertical angles are supplementary

• Vertical angles are congruent

Tags

CCSS.8.G.A.5

What postulate is used to state that two angles along the same line are supplementary?

• Linear Pair Postulate

• Segment Addition Postulate

• Transitive Property

• Vertical Angles Postulate