Prove that the points i^-j^, 4i^-3j^+k^ and 2i^-4j^+5k^ are the vertices of a right-angled triangle.

Prove that the points $\hat{i} - \hat{j}$ , $4 \hat{i} - 3 \hat{j} + \hat{k}$ and $\hat{2 i} - 4 \hat{j} + 5 \hat{k}$ are the vertices of a right-angled triangle.

Mixed-up sentence exercise

Put the parts in order to form a sentence. When you think your answer is correct, click on "Check" to check your answer. If you get stuck, click on "Hint" to find out the next correct part.