Determine whether A⃗=î+ĵ+k̂, B⃗=2î-ĵ+k̂, C⃗=3î+2k̂ are coplanar.
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Question

Determine whether A⃗=î+ĵ+k̂, B⃗=2î-ĵ+k̂, C⃗=3î+2k̂ are coplanar.

G1 Physics · Accepted Answer

B×C=(−2,−1,3). A·(B×C)=−2−1+3=0, so they are coplanar.