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If [tex] P , \; Q [/tex] and [tex] R [/tex] each represent a point in [tex] \mathbb{R} ^ 3 [/tex], then is it true that

[tex] \left\| {\overrightarrow {PQ} \times \overrightarrow {PR} } \right\| = \left\| {\overrightarrow {PQ} \times \overrightarrow {QR} } \right\| \; {?} [/tex]

[tex] \left\| {\overrightarrow {PQ} \times \overrightarrow {PR} } \right\| = \left\| {\overrightarrow {PQ} \times \overrightarrow {QR} } \right\| \; {?} [/tex]

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