Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Mathematics
Mathematics
Problem
Chord
A
B
AB
A
B
of a circle subtends
∠
A
C
B
\angle ACB
∠
A
C
B
at point
C
C
C
and
∠
A
D
B
\angle ADB
∠
A
D
B
at point
D
D
D
on the circumference, where
C
C
C
and
D
D
D
lie on the same side of
A
B
AB
A
B
. Which of the following is always true? a)
∠
A
C
B
+
∠
A
D
B
=
180
∘
\angle ACB + \angle ADB = 180^\circ
∠
A
C
B
+
∠
A
D
B
=
18
0
∘
b)
∠
A
C
B
=
∠
A
D
B
\angle ACB = \angle ADB
∠
A
C
B
=
∠
A
D
B
c)
∠
A
C
B
=
2
∠
A
D
B
\angle ACB = 2\angle ADB
∠
A
C
B
=
2∠
A
D
B
d)
∠
A
C
B
=
90
∘
\angle ACB = 90^\circ
∠
A
C
B
=
9
0
∘
Browse the problem library