In the given quadrilateral ABCD,
(Sum of interior angles of a quadrilateral is 360 degrees)
(Substitution Property)
(Addition Property of Equality)
The perimiter is 4 times as great as the lenght of any of its sides means that:
4 * a (perimiter) = 4 * a (4 times any of the sides)
It means that one side is 1/4 of the perimeter:
a = 1/4 * 4a
a = a
Answer: Perimeter is proportional to the side length by Perimeter = 4 * Sides or Side = 1/4 Perimeter.
Answer:
160cm^2
The area of the rectangle minus the area of the right angled triangle (20×10-8×10÷2)
