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National and Regional Contests
Vietnam Contests
Hanoi Open Mathematics Competition
2011 Hanoi Open Mathematics Competitions
11
11
Part of
2011 Hanoi Open Mathematics Competitions
Problems
(1)
area of a quadrilateral (2011 HOMC Junior Q11)
Source:
7/18/2019
Given a quadrilateral
A
B
C
D
ABCD
A
BC
D
with
A
B
=
B
C
=
3
AB = BC =3
A
B
=
BC
=
3
cm,
C
D
=
4
CD = 4
C
D
=
4
cm,
D
A
=
8
DA = 8
D
A
=
8
cm and
∠
D
A
B
+
∠
A
B
C
=
18
0
o
\angle DAB + \angle ABC = 180^o
∠
D
A
B
+
∠
A
BC
=
18
0
o
. Calculate the area of the quadrilateral.
geometry
area