Hi! Um, I need help on these ASAP please and thank you. I am completely unsure how to do them, and if someone can explain how to do them that would be great. I don't want to get anything wrong. Thank you so much!!!

Guest Feb 26, 2018

#1**+2 **

Opposit angles in a quadrilateral add to 180 (supplementary)

1. 3x+6 + x+2 = 180

4x = 172

x = 43 A= 3x+6 = 3 x 43 + 6 = 135 degrees

2 and 3 are similar

4 all of the angles in a quadrilateral add to 360

ElectricPavlov
Feb 26, 2018

#2**+2 **

Second one :

4x - 20 + x = 180

5x - 20 = 180 add 20 to both sides

5x = 160 divide both sides by

x = 32°

Third one :

116 + x = 180 subtract 116 from both sides

x = 64

So A = 2(64) - 40 = 128 - 40 = 88°

Last one :

x + 10 + x + 24 = 180

2x + 34 = 180 subtract 34 from both sides

2x = 146 divide both sides by 2

x = 73

So

A + C = 180

(x + 15) + C = 180

(73 + 15) + C = 180

88 + C = 180 subtract 88 from both sides

C = 92°

CPhill
Feb 26, 2018