From the figure, identify:

(a) the centre of the circle

(b) three radii

(c) a diameter

(d) a chord

(e) two-points in the interior

(f) a point in the exterior

(g) a sector

(h) a segment

Draw a rough sketch of a quadrilateral KLMN. State “

(a) two pairs of opposite sides,

(b) two pairs of opposite angles,

(c) two pairs of adjacent sides,

(d) two pairs of adjacent angles.

Investigate:

Use strips and fasteners to make a triangle and a quadrilateral.

Try to push inward at any one vertex of the triangle. Do the same to the quadrilateral.

Is the triangle distorted? Is the quadrilateral distorted? Is the triangle rigid?

Why is it that structures like electric towers make use of triangular shapes and not quadrilaterals?

Is every diameter of a circle also a chord?

Is every chord of a circle also a diameter?