如果圆锥的底面半径为4cm,母线长为5cm,那么它的侧面积______cm2.
底面圆的半径为4cm,则底面周长=8cm,侧面面积=12×8π×5=20πcm2.
May 12th is Xiao Ming’s birthday. He us to his birthday party. [ ]
A. asks
B. invites
C. makes
D. tells