Question

3D (or 2D) question

Answer 1

3D? it's only 2D for me. :/

Answer 2

(a) Find PA
(b) find angle between plane ABCD and plane PQCB (that is alpha)
(c) beta is the angle between PB and plane ABCD. Which one is greater, alpha or beta? Explain

Answer 3

The figure is a right pyramid with a square base. The length of the square is 20cm

Answer 4

sorry my memory is like a sieve. I think that's the question.

Answer 5

yes 2d is for me

Answer 6

Sorry, I thought that would be a 3D question :(

Answer 7

If its a right pyramid then the angle info seems a bit odd angle VBA = 60 and angle AVB = 72...?? because angle VAB should be 60

Answer 8

Just a minute

Answer 9

Sorry. That neglect the angle 60.

Answer 10

so the face angle at the vertex is 72..?

Answer 11

AVB = 72

Answer 12

Hmm. Perhaps I'd ask again when I have the question. I just tried my best remember the question but seems I failed