MathDB
Problems
Contests
National and Regional Contests
Russia Contests
Novosibirsk Oral Olympiad in Geometry
2020 Novosibirsk Oral Olympiad in Geometry
6
<A'B'C'=? angle bisectors, <B=120^o (2020 Novosibirsk Oral Geo Oly 7.6)
<A'B'C'=? angle bisectors, <B=120^o (2020 Novosibirsk Oral Geo Oly 7.6)
Source:
April 27, 2021
geometry
angle bisector
angles
Problem Statement
Angle bisectors
A
A
′
,
B
B
′
AA', BB'
A
A
′
,
B
B
′
and
C
C
′
CC'
C
C
′
are drawn in triangle
A
B
C
ABC
A
BC
with angle
∠
B
=
12
0
o
\angle B= 120^o
∠
B
=
12
0
o
. Find
∠
A
′
B
′
C
′
\angle A'B'C'
∠
A
′
B
′
C
′
.
Back to Problems
View on AoPS