Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Mathematics
Mathematics
Problem
Points
A
,
B
,
C
A, B, C
A
,
B
,
C
and
D
D
D
lie on a circle in that order. If
∠
A
C
B
=
42
∘
\angle ACB = 42^{\circ}
∠
A
C
B
=
4
2
∘
, prove that
∠
A
D
B
=
42
∘
\angle ADB = 42^{\circ}
∠
A
D
B
=
4
2
∘
.
Browse the problem library