2. area formula of rectangle: length× width a× b.
3. The perimeter formula of a square: side length ×4 a×4.
4. square area formula: side length × side length a× a.
5. The area formula of triangle: base× height ÷2 a×h÷2.
6. The area formula of parallelogram: base× height a× h.
7. The area formula of trapezoid: (upper bottom+lower bottom) × H ÷2 (a+b)×h÷2.
8. The circumference formula of a circle: π× diameter π× d.
9. The area formula of a circle: pi × radius× radius π r.
10. The surface area formula of a cuboid is (length× width+length× height+height× width) ×2 (a×b+a×h+h×b)×2.
1 1, cuboid volume formula: length× width× height a×b×h h h.
12, the surface area formula of the cube: side length × side length× 6 a× 6.
13. cuboid volume formula: side length × side length× side length a× a.
14, lateral area formula of cylinder: bottom circumference × height C × bottom h.
15, cylinder surface area formula: lateral area +2 bottom area s side +2 S bottom.
16. Volume formula of cylinder: bottom area × height s × bottom h.
17, surface area formula of cone: lateral area of cone+area of bottom circle +S side +S bottom.
18. Volume formula of cone: bottom area × height ÷3 S bottom ×h÷3.
19, the area formula of the ring: outer circle area-inner circle s outer circle area -S inner circle.
20. The perimeter formula of parallelogram: (long side+short side) ×2 (a+b)×2.