
Draw a number line. Mark point A at 0 and B at 8.1
such that AB = 8.1 units. Mark a point C on the
number line such that BC = 1 unit. Bisect AC such
that O is the mid-point of AC. With O as centre and
OC as radius, draw a semicircle to meet the number
line at C. Draw a line perpendicular to AC at B such
that the line intersects the semi-circle at D. With B as
centre and BD as radius, draw an arc to meet AC at F.
The point F represents
(iv)
on the number line:
Draw a number line. Mark point A at 0 and B at 2.3
such that AB = 4.5 units. Mark a point C on the
number line such that BC = 1 unit. Bisect AC such
that O is the mid-point of AC. With O as centre and