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Mathematics
Mathematics
Problem
In quadrilateral
A
B
C
D
ABCD
A
B
C
D
, the sides are
A
B
=
7
cm
,
B
C
=
10
cm
,
C
D
=
9
cm
,
D
A
=
8
cm
AB=7\,\text{cm},\;BC=10\,\text{cm},\;CD=9\,\text{cm},\;DA=8\,\text{cm}
A
B
=
7
cm
,
B
C
=
10
cm
,
C
D
=
9
cm
,
D
A
=
8
cm
and the diagonal
A
C
=
11
cm
AC=11\,\text{cm}
A
C
=
11
cm
. Find the area of
A
B
C
D
ABCD
A
B
C
D
(correct to two decimal places). a)
71.00
cm
2
71.00\,\text{cm}^2
71.00
cm
2
b)
72.35
cm
2
72.35\,\text{cm}^2
72.35
cm
2
c)
69.79
cm
2
69.79\,\text{cm}^2
69.79
cm
2
d)
65.12
cm
2
65.12\,\text{cm}^2
65.12
cm
2
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