Triangle: Half the product of the longest side and the perpendicular distance from it to the apex.
Trapezoid: Half the product of the sum of its bases and the height.
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area triangle = 1/2 base times height area trapezoid = 1/2 (sum of bases) times height
The formula for the area of a trapezoid is A = 1/2 (b1 + b2)/h where b1 is the upper base of the trapezoid , b2 is the lower base of the trapezoid and h is the height of the trapezoid. Since a triangle has only one base , replace either b1 or b2 with zero. Thus the area of a triangle is A = 1/2bh
a parallelogram,a right triangle and a triangle
Depending how you halve it can be a right angle triangle or an isosceles trapezoid
It is the right angle triangle which has 3 sides whereas all quadrilaterals have 4 sides.