Page 141 - Math Smart - 7
P. 141
Speed Challenge 9
PAIR WORK
Race your partner to climb the levels for angles at a point!
0 Start at level 1. Calculate the unknown angles.
0 Check your answers with your partner once you are done for each level.
If your answer is incorrect, stay in the level and rework the calculations,
o Once you have calculated all the level 1 angles correctly, move on to level 2.
0 Continue until you have worked out all the angles in level 4 correctly.
A B C D E
■<k'
A~^°
(
X
( LA—" '
^~~237°
223°
w/
'(p=>- 12oMio^ <T>
<
2-
160° 170° UJ
160°
/30?\ <
\ /A Lrr w 2.
X
Ni
X
^^^100^^ \ 115° ^
—X X
5.3.3 Vertically opposite angles
Vertically opposite angles are the angles opposite
each other when two straight lines cross.
AB and CD are straight lines that intersect at point M.
The point of Intersection is the vertex.
AMD = CMB AMC = DMB
vertex
CD
