Page 140 - Math Smart - 7
P. 140
Example 3
Q Calculate the size of BOC
Remember to state the
210'
reason 'zis at a point'.
104° + 110° + BOC = 360° Us at a point)
BOC = 360°-104°-110°
Notice that the angles = 146°
meet at point 0 and
fit together without
leaving any gaps or Q Calculate the value of o.
overlaps.
The sum of angles at a
2a °+102°+180° = 360° Us at a point)
point is 360°. We write
'zls at a point' in the 2a° = 360°-102°-180°
working. = 78°
o° = _78°
2
0 = 39
Check My
Understanding
Q Calculate the value of a. Q Calculate the value of b.
Q Calculate the size of angle c. Q Angles AMB, BMCand CMD are all the same
size. Angle AMD is twice as big as each of the
other angles. Work out the size of each angle.
UNIT 6 Angles and Their Properties
