The base and perpendicular height are at right angles. Showing that a parallelogram has the same area as a rectangle: Split the parallelogram into a right-angled triangle and a trapezium. Move the ...

ii) (Motivate) In a parallelogram opposite angles are equal and conversely. iii) (Motivate) In a parallelogram opposite sides are equal and conversely. iv) (Motivate) A quadrilateral is a ...