Curriculum
Mathematics — First Preparatory
Unit 1: Numbers
0/10
Unit 2: Algebra
0/4
Unit 3: Statistics
0/6
Text lesson
Quadrilaterals
Quadrilaterals
The quadrilateral and its angles
The quadrilateral and its angles
- A quadrilateral is a polygon with four sides and four angles.
- The sum of its interior angles is 360°, because a diagonal divides it into two triangles, and each triangle has angles that add up to 180°.
- The perimeter is the sum of the lengths of the four sides.
- The area depends on the type of the quadrilateral, as the examples show.
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