Introduction to Proof

Question 1

Which angle pairs are supplementary? Check all that apply.

Revolt · Accepted Answer

∠4 and ∠3; ∠4 and ∠5; ∠3 and ∠6

Question 2

Question 2

Revolt · Accepted Answer

ACD and BCD

Question 3

additionreflexive✔ substitutionsymmetric

Revolt · Accepted Answer

substitution

Question 4

1✔ 23

Revolt · Accepted Answer

2

Question 5

Use the diagram to identify the special angle pairs. ADC and BDC are . A pair of complementary angles is angles .

Revolt · Accepted Answer

supplementary angles; Selection 1: supplementary angles; Selection 2: ACD and BCD

Question 6

What is the measure of EDH?

Revolt · Accepted Answer

50°

Question 7

What is the measure of CBE?

Revolt · Accepted Answer

72°

Question 8

Let mA = 40°. If B is a complement of A, and C is a supplement of B, find these measures. mB = ° mC = °

Revolt · Accepted Answer

Part 1: 50; Part 2: 130

Question 9

Based on the diagram, which reason justifies this statement?If ∠CEF is complementary to ∠DCF, then∠DCF ≅ ∠FEG.

Revolt · Accepted Answer

Complements of the same angle are congruent.

Question 10

By the congruent supplements theorem, what can you conclude?

Revolt · Accepted Answer

FBC DBG

Introduction to Proof Answers