1, area of triangle = base × height ÷2 Formula S= a×h÷2?

2. area of a square = side length × side length formula S= a×a?

3. area of rectangle = length × width formula S= a×b?

4. area of parallelogram = bottom× height formula S= a×h?

5. trapezoidal area = (upper bottom+lower bottom) × height ÷2 Formula S=(a+b)h÷2?

6. cuboid volume = length× width× height formula: V=abh?

7. cuboid volume = bottom area × height formula: V=abh?

8. The circumference of a circle = diameter × π formula: L = π d = 2π r?

9. The area of a circle = 2 radius × π formula: S = π R2?

10, the surface (side) area of the cylinder is equal to the perimeter of the bottom multiplied by the height. Formula: s = ch = π DH = 2π RH?

1 1, the surface area of the cylinder: the surface area of the cylinder is equal to the perimeter of the bottom multiplied by the height plus the area of the circles at both ends. The formula S=ch+2s=ch+2πr2?

12, the volume of the cylinder: the volume of the cylinder is equal to the bottom area multiplied by the height. Formula: V=Sh