Lines
ab
and
cd
(if present in the picture) are straight lines. fill in the blank to find x.

statement reason
1. m∠aoc +m∠coe +m∠ = m∠
2. m∠aob =
3. m∠eob =
4. x + +90°=180°
substitution
5. x = algebra

x = 30

Step-by-step explanation:

Since AB is a straight line then

∠AOB + ∠COE + ∠EOB = 180° ← substitute values

x + 2x + 90 = 180 ( subtract 90 from both sides )

3x = 90 ( divide both sides by 3 )

x = 30

Step-by-step explanation:

We are given that lines AB and CD are straight lines.

We have to fill in the blank space to find x.

1.

By substitution

2.

Because angle AOB is a straight angle and measure of angle AOB=180 degrees.

3.

Because it is right angle and measure of right angle is 90 degrees.

4.

By substitution

5.