Calculation formula of trapezoid

When the vertex passing through the upper sole is taken as the vertical line of the lower sole, the lower sole can be divided into three parts, each of which is equal. Since the height is equal to the upper sole, it is equal to a part of the lower sole, so that the two lower sole angles are 45 degrees and the upper sole angle is 135 degrees.

Perimeter formula

The perimeter formula of trapezoid: upper bottom+lower bottom+waist+waist, expressed in letters: A+B+C+D. The perimeter formula of isosceles trapezoid: upper bottom+lower bottom +2 waist.

Area formula

The area formula of trapezoid is (upper bottom+lower bottom) × height ÷2, which is expressed in letters: S=(a+b)×h÷2. Deformation1:h = 2s÷ (a+b); Variant 2: a = 2s ÷ h-b; Variant 3: B = 2S ÷ H-A. Another formula for calculating trapezoidal area: midline × height, expressed in letters: L H.

Trapezoidal region with vertical diagonal

The area of trapezoid with diagonal lines perpendicular to each other is: diagonal line x diagonal line ÷2.