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# Calculating acute angle of square pyramid watch

1. Q: ABCD is base of a square pyramid of side 2 units and V is the vertex. The pyramid is symmetrical and of height 4 units. Calculate acute angle between AV and BC, giving your answer to 1 d.p.
Here's my w/o:
AV = sqrt(17)
Answer is 76.4. Not sure how to get it, this question is in the vectors sectors btw.
2. Bump
3. Bump
4. (Original post by TSRforum)
Q: ABCD is base of a square pyramid of side 2 units and V is the vertex. The pyramid is symmetrical and of height 4 units. Calculate acute angle between AV and BC, giving your answer to 1 d.p.
Here's my w/o:
AV = sqrt(17)
Answer is 76.4. Not sure how to get it, this question is in the vectors sectors btw.
is this question on vector methods?
5. Dot Product, consider the vectors AV and AC.
6. (Original post by Argylesocksrox)
Dot Product, consider the vectors AV and AC.
What are the vectors AV and AC?
7. (Original post by TSRforum)
What are the vectors AV and AC?
The vector from A going to V, so V-A, and AC=C-A
8. (Original post by Argylesocksrox)
The vector from A going to V, so V-A, and AC=C-A
What is the vector of A, V & C? I don't know how to work it out

Edit: I got the answer, did labelling at beginning wrong which gave me wrong vectors

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