Question

A triangle measures 12 degrees and 40 degrees what is the measurement of the 3rd angle of the triangle

Answer 1

`\boxed{ \bold{ \huge{ \boxed{ \sf{128°}}}}}`

Explanation:

Sum of angles of triangle add up to 180°

Let the third angle be x

Create an equation and solve for x

`\sf{x + 12° + 40° = 180°}`

`\dashrightarrow{ \sf{x + 52° = 180°}}`

`\dashrightarrow{ \sf{x = 180° - 52°}}`

`\dashrightarrow{ \boxed{\sf{x = 128°}}}`

Hope I helped!

Best regards! :D