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5
<C wanted, AB = CH, orthocenter (2017 Auckland MO S5)
<C wanted, AB = CH, orthocenter (2017 Auckland MO S5)
Source:
December 31, 2020
geometry
angles
orthocenter
Problem Statement
The altitudes of triangle
A
B
C
ABC
A
BC
intersect at a point
H
H
H
.Find
∠
A
C
B
\angle ACB
∠
A
CB
if it is known that
A
B
=
C
H
AB = CH
A
B
=
C
H
.
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