Parallelogram area = length x height

Triangle area = length x height \2

The area of the circle = π (π 3.14) the square of the x radius.

Calculation formula of circle: The simplest thing is to infer that the area of parallelogram is equal to the base X height according to the area of rectangle, because two identical triangles can form a parallelogram. The formula for calculating the area of avail×a×ble is: the area of triangle = bottom× height ÷2 [S=ah÷2] or the product of any two sides of triangle× sine value of the included angle between these two sides ÷2 [S=ab×sin× 1/2]. The formula for calculating the trapezoidal area is: (upper bottom)

1, number of copies × number of copies = total number of copies/number of copies = total number of copies/number of copies = number of copies.

2. 1 multiple× multiple = multiple1multiple = multiple/multiple = 1 multiple

3. Speed × time = distance/speed = time/distance/time = speed.

4. Unit price × quantity = total price ÷ unit price = total quantity ÷ quantity = unit price

5. Work efficiency × working hours = total workload ÷ work efficiency = working hours ÷ total workload ÷ working hours = work efficiency.

6. Appendix+Appendix = sum, and-one addend = another addend.