Solve for x. ans. Find the sum of the measures of the interior angles of a hexagon. Find the measure of one interior angle of a regular octagon. If the diagonals of a quadrilateral are congruent, then the quadrilateral is a rectangle. False - Might be an isosceles trapezoid or another quadrilateral unless the figure was given to be a parallelogram too.
All squares are rectangles.
A rectangle is a quadrilateral with 4 right angles. Squares fit that definition. They just have extra properties. If a quadrilateral has 4 congruent sides then it is a square. To be a square you need extra properties such as 4 right angles or congruent diagonals.