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Mathematics
Problem
If
f
:
R
→
N
∪
{
0
}
f: R \rightarrow N \cup \{0\}
f
:
R
→
N
∪
{
0
}
, where
f
f
f
(area of triangle joining points
P
(
5
,
0
)
P(5,0)
P
(
5
,
0
)
,
Q
(
8
,
4
)
Q(8,4)
Q
(
8
,
4
)
and
R
(
x
,
y
)
R(x,y)
R
(
x
,
y
)
such that angle
P
Q
R
PQR
P
QR
is a right angle) = number of triangles, then which of the following is true? (A)
f
(
5
)
=
4
f(5) = 4
f
(
5
)
=
4
(B)
f
(
7
)
=
0
f(7) = 0
f
(
7
)
=
0
(C)
f
(
6.25
)
=
2
f(6.25) = 2
f
(
6.25
)
=
2
(D)
f
(
4.5
)
=
4
f(4.5) = 4
f
(
4.5
)
=
4
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