303,586 views
25 votes
25 votes
A, B and C lie on a straight line.

Given that angle

y

= 128° and angle

z

= 91°, work out

x

.

A, B and C lie on a straight line. Given that angle y = 128° and angle z = 91°, work-example-1
User Bosniamaj
by
2.9k points

2 Answers

21 votes
21 votes

Answer:

x+91+(180-y)=180

180-128=52

x+91+52=180

143+x=180

x=37

Hope This Helps!!!

User Gabor De Mooij
by
3.1k points
14 votes
14 votes

Answer:

x = 37°

Explanation:

The exterior angle of a triangle is equal to the sum of the 2 opposite interior angles .

y is an exterior angle of the triangle , then

y = x + z , that is

128° = x + 91° ( subtract 91° from both sides )

37° = x

User Donnie H
by
3.0k points
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