Question

Find the missing angle.
40°
80°
X

What is the missing angle?

Answer 1

`\boxed{\sf x=60^o}`

Explanation:

By applying the sum property.

`\sf 40+80+x=180^o`

Add the numbers:- 40 + 80 = 120

• 
  `\sf x+120=180`

Subtract 120 from both sides:-

• 
  `\sf x+120-120=180-120`

• 
  `\sf x=60`

Answer 2

60°

Explanation:

Sum of angles of triangle = 180°

x + 40 + 80 = 180

x + 120 = 180 {Subtract 80 from both sides}

x = 180 - 120

x = 60°