The Unknown Angle in a Quadrilateral
A quadrilateral has a total of four angles. When 3 angles are already given in the question and one angle is unknown, using the 3 known angles, we can find out the unknown one.
Examples:
![Picture](/uploads/2/3/4/0/23408802/3725785.png)
Find the unknown angle in the quadrilateral.
Solution
360° = 60° + 110° + 75° + m°
360° = 245° + m°
m = 350 - 245
m = 115°
Solution
360° = 60° + 110° + 75° + m°
360° = 245° + m°
m = 350 - 245
m = 115°
Quiz
1. Calculate the unknown angle in each of these quadrilaterals: