special quadrilaterals
DESCRIPTION
Special Quadrilaterals. Honors Geometry. True/False. Every square is a rhombus. TRUE – four congruent sides. True/False. If the diagonals of a quadrilateral are perpendicular, then it is a rhombus. False – diagonals don’t have to be congruent or bisect each other. True/False. - PowerPoint PPT PresentationTRANSCRIPT
Honors Geometry
Special Quadrilaterals
True/False
Every square is a rhombus.
TRUE – four congruent sides
True/False
If the diagonals of a quadrilateral are perpendicular, then it is a rhombus.
False – diagonals don’t have to be congruent or bisect each other.
True/False
The diagonals of a rectangle bisect its angles.
FALSE (draw an EXTREME rectangle!)
True/False
A kite with all consecutive angles congruent must be a square.
TRUE
True/False
Diagonals of trapezoids are congruent.
FALSE – not always!
True/False
A parallelogram with congruent diagonals must be a rectangle.
TRUE
True/False
Some rhombuses are rectangles.
True – some rhombuses also have right angles
True/False
The diagonals of a rhombus are congruent.
False – not always!
True/False
If the diagonals of a parallelogram are perpendicular, it must be a rhombus.
TRUE
True/False
Diagonals of a parallelogram bisect the angles.
FALSE
True/False
A quadrilateral that has diagonals that bisect and are perpendicular must be a square.
FALSE (could be rhombus… right angles not guaranteed)
Sometimes/Always/Never
A kite with congruent diagonals is a square.
FALSE – could be, but diagonals don’t have to bisect each other.
Give the most descriptive name:
A parallelogram with a right angle must be what kind of shape?
Rectangle
Give the most descriptive name:
A rectangle with perpendicular diagonals must be what kind of shape?
SQUARE
Give the most descriptive name
A rhombus with consecutive angles congruent must be a:
SQUARE
Give the most descriptive name:
A parallelogram with diagonals that bisect its angles must be a:
Rhombus
Proving that a Quad is a RectangleIf a parallelogram contains at least one
right angle, then it is a rectangle.If the diagonals of a parallelogram are
congruent, then the parallelogram is a rectangle.
If all four angles of a quadrilateral are right angles, then it is a rectangle.
Proving that a Quad is a KiteIf two disjoint pairs of consecutive sides of
a quadrilateral are congruent, then it is a kite.
If one of the diagonals of a quadrilateral is the perpendicular bisector of the other diagonal, then it is a kite.
Proving that a Quad is a RhombusIf a parallelogram contains a pair of
consecutive sides that are congruent, then it is a rhombus.
If either diagonal of a parallelogram bisects two angles of the parallelogram, then it is a rhombus.
If the diagonals of a quadrilateral are perpendicular bisectors of each other, then the quadrilateral is a rhombus.
Proving that a Quad is a SquareIf a quadrilateral is both a rectangle and a
rhombus, then it is a square.
Proving that a Trapezoid is IsoscelesIf the non-parallel sides of a trapezoid are
congruent, then it is isosceles.If the lower or upper base angles of a
trapezoid are congruent, then it is isosceles.
If the diagonals of a trapezoid are congruent, then it is isosceles.