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Mathematics
Mathematics
Problem
A quadrilateral has vertices at coordinates
A
(
0
,
0
)
A(0, 0)
A
(
0
,
0
)
,
B
(
5
,
0
)
B(5, 0)
B
(
5
,
0
)
,
C
(
7
,
6
)
C(7, 6)
C
(
7
,
6
)
, and
D
(
2
,
6
)
D(2, 6)
D
(
2
,
6
)
. Find the cosine of the acute angle formed by the intersection of its diagonals.
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