Explain why a rectangle is a convex quadrilateral.

ABC is a right-angled triangle and O is the mid-point of the side opposite to the right angle. Explain why O is equidistant from A, B and C. (The dotted lines are drawn additionally by to help you.)

A mason has made a concrete slab. He needs it to be rectangular. In what different ways can he make sure that it is rectangular?

A square was defined as a rectangle with all sides equal. Can we define it as rhombus with equal angles? Explore this idea.

115.

Can a trapezium have all angles equal? Can it have all sides equal? Explain.

The diagonals of a rhombus bisect each other at __________ .

All angles of rectangle are equal and are __________ angles.

All sides of a __________ are equal and all angles are right angles.

A rhombus is a quadrilateral with __________ of equal length.

A square has sides of equal length and angels of equal measure, so it is a __________ polygon.