*平面图形的周长和面积：
" G7 n; m2 D' I% C9 C8 V
( S8 S: F* d, `1 M4 R0 gPerimeter1 V4 m2 \: w( }8 c% i3 p
Area9 Y! b! U: ?( F t) p' E6 Q$ _
Triangle
/ U$ p0 c2 a `: ?) `; ^2 W" k" I" V三边之和
9 W. X0 h' _3 M$ e0 ^" n; \( e3 s(底×高)/25 Z) w& O4 y% ?& v0 y9 `$ n
Square! P0 M+ t7 j) O
边长×4+ c- c, ^6 S! ^9 J
边长的平方( J9 q4 x$ _4 P6 t
Rectangle. Y# q0 ?9 e8 D) ^4 ?; a, B6 f9 |
(长+宽)×2
3 R5 f( e3 T$ h* L+ ^( A长×宽7 Y) Q; M J7 [# o
Parallelogram7 N3 W! P! R) g" D: D) O
(长+宽)×22 j5 |( u o2 s! O6 [1 z
底×高3 L( ^# C2 n& ]' x% D
Trapezoid$ H& V# e1 s u: E, [; \7 |- f& }
四边之和/ W% k/ P w% v% ~9 d
(上底+下底)×高/2
) }6 W/ c7 a8 ?# }Rhombus
/ o% R( {! R& I% y. E9 Z/ i边长×4. u8 L$ r, x. R4 t3 c
两条对角线之积的1/2
3 b" E s- T2 n9 x J% R/ ACircle6 y. i+ y" A: _; y9 w; R4 o/ G/ ]) u
2πr=πd
. @: T4 P4 U2 ?$ l9 u' Aπr20 i( U* q1 a( W: i: T
' ?8 M+ D7 h7 z1 x: L
*立体图形的表面积和体积
& U9 @* S& I' `* p( t; R! B4 n% T) @ 8 I! t# h2 v; U! b+ _9 O
Volume9 l& |" d1 Y$ n: b
Surface Area4 }" I, u D8 g' }( N8 v( {8 I
Rectangular Prism1 | ]7 C" Z5 e( k: v
长×宽×高
1 Z) a/ k% `# v3 e2 V! V! j4 Q i2(长×宽+长×高+宽×高)8 f k$ Y# m" t, ]7 |
Cube. [+ U4 ^2 y! `, N P4 y
棱长的立方5 A) O9 v, ~+ E/ K
6×棱长×棱长
7 c: o! H* W( D; @6 CRight Circular Cylinder* }3 G) d9 _' b+ @/ t6 X5 q
πr2h. b' L7 V/ A$ f- d! T; w
2πr h(侧)+ 2πr2(底)
8 ]6 r% `9 e- o1 b& r NSphere
# I! D- `6 {" y) K" n5 p8 h4πr3/3* o: M% h* \6 G1 p+ y
4πr2
# I5 o/ i9 {9 p$ p! Q( ERight Circular Cone
1 Q# m. N) w% f4 L3 iπr2h/31 f, A0 Z o4 J+ M3 t c
lr/2 (l为母线) |
发表于 2012-8-15 12:55:17
