1103101207

Level: 
Project ID: 
1103101207
Accepted: 
1
Clonable: 
0
Easy: 
0
Let ABCD be a regular tetrahedron with an edge length of 5cm. Let φ be the angle between the edge AD and the base plane ABC (see the picture). Choose the correct expression for φ:
cosφ=33
tgφ=3
tgφ=33
cosφ=3