ts007096小学数学教师教学基本功讲座.pdf

S = 1 2 ah 1 S = 1 2 a + b h 2 S mh S = r 360 n 2 V = 1 3 r h 2 S a b h S ah bh a b h a b h = + = + = + = + 2 2 2 2 2 ( ) ( ) S ah b a h S a b h a b h a b h = + - = + = + = + ( ) ( ) ( ) 2 2 2 2 S ah b h S a b h a b h a b h = + = + = + = + 2 2 2 2 2 2 2 ( ) ( )