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Novosibirsk Oral Olympiad in Geometry
2016 Novosibirsk Oral Olympiad in Geometry
1
AD=? ABCD, <A=<C=120^o, AB=CD=1,CB=4 (2016 Novosibirsk Oral Geo Oly 8-9 p1)
AD=? ABCD, <A=<C=120^o, AB=CD=1,CB=4 (2016 Novosibirsk Oral Geo Oly 8-9 p1)
Source:
April 26, 2021
geometry
equal angles
Problem Statement
In the quadrilateral
A
B
C
D
ABCD
A
BC
D
, angles
B
B
B
and
C
C
C
are equal to
12
0
o
120^o
12
0
o
,
A
B
=
C
D
=
1
AB = CD = 1
A
B
=
C
D
=
1
,
C
B
=
4
CB = 4
CB
=
4
. Find the length
A
D
AD
A
D
.
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