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Mathematics
Mathematics
Problem
Lines
A
B
AB
A
B
and
C
D
CD
C
D
intersect at
O
O
O
such that
∠
A
O
C
:
∠
C
O
B
=
7
:
2
\angle AOC : \angle COB = 7:2
∠
A
O
C
:
∠
C
O
B
=
7
:
2
. a. (i) Find the measures of
∠
A
O
C
\angle AOC
∠
A
O
C
and
∠
C
O
B
\angle COB
∠
C
O
B
. b. (ii) Hence determine the measures of the other two angles formed at
O
O
O
.
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