Quadrilaterals and polygonsLesson 1 of 7Free preview
The angles of a quadrilateral add to 360°
One diagonal cuts any quadrilateral into two triangles, so its angles make 2 × 180° = 360°.
Quadrilaterals and polygonsLesson 1 of 7Free preview
One diagonal cuts any quadrilateral into two triangles, so its angles make 2 × 180° = 360°.