3 The diagram shows a tetrahedron ABCD.
M is the mid-point of CD. AB = 4m,
AC 3 m, AD= 3 m.
a
b
C
d
e
Calculate angle ACB.
Calculate BC.
Calculate CD.
Calculate the length of BM.
Calculate the angle BCD.
D
3 m
B
4 m
M
3 m
C