the height of a glass tumbler is 12 cm. the radius of its circular base is 3 cm and that of rim is 4cm.the volume of tumbler​

tumbler is in the shape of frustum.
h = 12 cm
r₁ = 3 cm
r₂ = 4 cm
                                                                 
volume of frustum =  22/7*h/3 ( r₁² + r₂² + r₁r₂)
                               =  22/7* 12/3 ( 3*3 + 4*4 + 3*4)
                               =  22/7*4 ( 9 + 16 + 12)
                               =  88/7 *(37)
                               =   465.142 cm³