4 . When a right triangle of area 3 is rotated 360° about its shorter leg, the
solid that results has a volume of 30. What is the volume of the solid
that results when the same right triangle is rotated about its longer
leg?
(A) 0.99
(B) 7.90
(C) 8.88
(D) 31.42
(E) 41.125 . The pyramid in Figure 3 is composed of a square base of area 12 and
four equilateral triangles. What is the volume of the pyramid?
Figure 3(A) 9.8
(B) 14.7
(C) 17.0
(D) 19.6
(E) 29.4