Plane Figures
Properties of triangles · Properties of quadrilaterals · Constructions and polygons
Use the angle sum of a triangle to work out a missing angle.
Tell a rhombus, a kite and a trapezium apart and state their properties.
Construct a rectangle, a square and a parallelogram with compass and ruler.
Work out the interior and exterior angles of a polygon.
Cut out a triangle and tear off all three corners.
Lay the three corners side by side at one point.
They always close into a straight angle, so the total is 180 degrees.
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