1, draw a parallelogram with an area of 7 small squares according to:
Area of parallelogram = base × height.
2. Only the product of the base and the height is 7, such as a parallelogram, the base is 7 squares, and the height is 1 square.
Draw a triangle with a small square according to:
Area of triangle = base × height ÷2.
3. Only half of the product of base and height is 7, for example, a triangle with a base of 7 squares and a height of 2 squares.
Draw a trapezoid with an area of 7 small squares according to the following equation:
Trapezoidal area = (upper bottom+lower bottom) × height ÷2.
As long as the product of the sum of the upper and lower bottoms and the height is half 7, for example, the upper bottom is 3 squares, the lower bottom is 4 squares and the height is 2 squares.
So draw the chart as follows:
Extended data
The method of judging parallelogram:
1. Two groups of parallelograms with opposite sides are parallelograms (definition judgment method).
2. A set of quadrilaterals with parallel and equal opposite sides is a parallelogram.
3. Two groups of quadrilaterals with equal opposite sides are parallelograms.
4. Two groups of quadrangles with equal diagonal angles are parallelograms (two groups of opposite sides are judged to be parallel).
5. Quadrilaterals whose diagonals bisect each other are parallelograms.
Baidu encyclopedia-parallelogram