Quadrilaterals
Lesson
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A quadrilateral is a polygon that has
4 sides and 4 angles.

 
The sum of the measures of the angles of any quadrilateral always equals 360 degrees.

How to find unknown angles

Example 1:

The sum of the measures of the angles of any quadrilateral always equals 360 degrees.

Solve:

90 +90+ 90 +? = 360

270 + ?=360

360 -270 = ?

? = 90

Example 2:



The sum of the measures of the angles of any quadrilateral always equals 360 degrees.

Solve:

115 + 65 + 65 +? = 360

245 + ?=360

360 -245 = ?

? = 115

 

Remember: The sum of the measures of the angles of any quadrilateral always equals 360 degrees.
 


Let's Practice!

 
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