Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Mathematics
Mathematics
Problem
In a circle, chord
A
B
AB
A
B
subtends an angle of
60
∘
60^\circ
6
0
∘
at the centre. Another chord
C
D
CD
C
D
is equal in length to
A
B
AB
A
B
. What is the measure of
∠
C
O
D
\angle COD
∠
C
O
D
? a)
120
∘
120^{\circ}
12
0
∘
b)
60
∘
60^{\circ}
6
0
∘
c)
30
∘
30^{\circ}
3
0
∘
d)
90
∘
90^{\circ}
9
0
∘
Browse the problem library