Page 160 - Math Smart - 7

^*Challenge!
In the diagram, lines AB, CD, DE and FG
are straight lines.
Calculate the size of the unknown angles.
State your reasons clearly in the working.

Challengel Draw arrow heads on the diagram
to show that AB is parallel to CD.
There are four pairs of equal angles.
Show the four pairs of equal angles on the diagram.

*Challengel
In the diagram, /.D- AF=AS^. Df and BE
are straight lines. What is the relationship
between line segments DE and BR

Mathematics Connect % y O Spotlight

Find out more about
Angles in Action!
using a digital theodolite.
We measure lines and
angles on paper using mm
rulers and protractors. But
how do we measure angles
a road makes or how steep
a slope is?

A theodolite is an
instrument used for
measuring angles
accurately. Theodolites are
used to survey landscapes
to draw accurate maps.
They have also been
adapted for use in
meteorology and even
rocket launches.