TA CÓ D     R H CM12 62 2 .6.6 72S XQ     RH   (CM2) 2 272...

Bài 2:

Ta có

d     r h cm

12 6

2 2 .6.6 72

S xq     rh   (cm

)

2 2

72 2 72 2 .6 144

S tp         r   (cm

)

. . .6 .6 216

V   r h     (cm

)