Sides of a Rectangle
How to solve the sides of a rectangle problems: property, example, and its solution.
A rectangle is a parallelogram
whose interior angles are all right angles.
So a rectangle has all the properties of a parallelogram.
Just like the sides of a parallelogram,
the opposite sides of a rectangle are congruent.
The blue sides are the opposite sides of the rectangle.
So AB = DC = 12.
Its legs are 5 and 12.
So it's a (5, 12, 13) triangle.
So AC = 13.