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Mathematics
Mathematics
Problem
Find the centre of the circle given by
r
⋅
(
i
^
+
2
j
^
+
2
k
^
)
=
15
\mathbf{r} \cdot (\hat{i} + 2\hat{j} + 2\hat{k}) = 15
r
⋅
(
i
^
+
2
j
^
+
2
k
^
)
=
15
and
∣
r
−
(
j
^
+
2
k
^
)
∣
=
4
|\mathbf{r} - (\hat{j} + 2\hat{k})| = 4
∣
r
−
(
j
^
+
2
k
^
)
∣
=
4
.
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