Question

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Answer 1

1. AD || CB 1. Given
AB ⊥ CB
2. <B = <A = 90 2. Properties of perpendicular Lines
3. <2 + <3 + 90 = 180 3. The sum of interior angles of a triangle is 180
<4+ <1 + 90 = 180
4. <2 + <3 = 90 4. Simplification
<4 + <1 = 90
5. <3 = <4 5. Vertical Angle Theorem
6. <2 + <4 = 90 6. Transitive Property of Equality
<3+<1 = 90

Answer 2

AD||CB & AB_|_CB => A =90
D + O1 = 90
c + O2 =90=>O1=O2
D = c
D + c = 90

Answer 3

@ : stupidinmath , They re not complementary ! :)

Answer 4

1. AD || CB 1. Given
AB ⊥ CB
2. <B = <A = 90 2. Properties of perpendicular Lines
3. <2 + <3 + 90 = 180 3. The sum of interior angles of a triangle is 180
<4+ <1 + 90 = 180
4. <2 + <3 = 90 4. Simplification
<4 + <1 = 90
5. <3 = <4 5. Vertical Angle Theorem
6. <2 + <4 = 90 6. Transitive Property of Equality
<3+<1 = 90

Answer 5

An E.ali is correct aswell

Answer 6

How's that happen -___-

Answer 7

poph

Answer 8

What?! Not complementary? But its a proof.
But, thank you, guys!<3