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Mathematics
Mathematics
Problem
Find the measure of
P
Q
R
^
\widehat{PQR}
P
QR
given: a.
P
(
0
,
2
,
−
2
)
P(0, 2, -2)
P
(
0
,
2
,
−
2
)
,
Q
(
3
,
−
1
,
−
4
)
Q(3, -1, -4)
Q
(
3
,
−
1
,
−
4
)
,
R
(
4
,
0
,
−
1
)
R(4, 0, -1)
R
(
4
,
0
,
−
1
)
b.
P
(
−
3
,
2
,
1
)
P(-3, 2, 1)
P
(
−
3
,
2
,
1
)
,
Q
(
5
,
0
,
1
)
Q(5, 0, 1)
Q
(
5
,
0
,
1
)
,
R
(
−
3
,
−
1
,
2
)
R(-3, -1, 2)
R
(
−
3
,
−
1
,
2
)
.
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