Volume of cone = (pi/3)r^2h Volume of hemisphere = (1/2) (4pi/3)r^3 we are given r=6/2=3cm, h(cone)=8 cm, so total volume =(pi/3)r^2h + (1/2)(4pi/3)r^3 =(pi/3)*3^2*8 + (1/2)(4pi/3)*3^3 =24pi + 18pi =42pi cm^3 =131.9 cm^3 (approx.)