(2009-04-03 20: 10:00)
Label:
Casual conversation
Classification: education and teaching
Written expression
1. square c perimeter s area a side length perimeter = side length× 4c = 4a area = side length× side length s = a× a.
2. Cube V: volume A: side surface area = side length × side length× 6s table =a×a×6 volume = side length× side length× side length V = a× a× a.
3. rectangle c perimeter s area a side length perimeter = (length+width) ×2 C=2(a+b) area = length × width S=ab.
4. cuboid v: volume s: area a: length b: width h: height (1) surface area = (length× width+length× height+width× height )× 2s = 2 (AB+ah+BH).
(2) volume = length× width× height V=abh
5. triangle s area a base h height area = base × height ÷2 s=ah÷2 triangle height = area × 2 ÷ base triangle base = area × 2 ÷ height.
6. parallelogram s area a base h height area = base x height s=ah
7. Trapezoidal S area A upper bottom B lower bottom H height area = (upper bottom+lower bottom) × height ÷2 s=(a+b)×h÷2.
8. Circular S area c perimeter ∏d= diameter r= radius (1) perimeter = diameter x ∏ = 2 x ∏× radius c = ∏ d = 2 ∏ r.
(2) area = radius × radius×∈
9. cylinder v: volume h: height s; Bottom area r: bottom radius c: bottom perimeter
(1) Transverse area = bottom circumference × height.
(2) Surface area = lateral area+bottom area ×2
(3) Volume = bottom area × height
(4) Volume = lateral area ÷2× radius.
10. cone v: volume h: height s; Bottom area r: bottom radius volume = bottom area × height ÷3
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