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Quadrilaterals Bryce Hall 4 Wennersten

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Parallelograms Definition: a quadrilateral having both pairs of opposite sides parallel to each other.

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**Properties The opposite sides are parallel**

The opposite sides are also congruent The opposite angles are congruent The diagonals bisect each other Bisects

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**Formulas for Parallelograms**

Perimeter = 2a + 2b Area = b x h The area is b x h because a parallelogram is basically just two right triangles and a rectangle, so the area = length x width and length x width = b x h :3

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**Properties we don’t Know**

The adjacents sides are parallel, so their measure is 180° x + y = 180°

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Rhombus Definition: an equilateral parallelogram, including the square as a special case.

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**Properties of Rhombuses**

Have 4 equal/congruent/same sides Their diagonals are perpendicular Diagonals make right triangles The diagonals bisect their angles

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**Formulas Perimeter = all four sides added together**

x + x + x +x (x4) = perimeter Area = length of 2 diagonals times ½ Area = ½ab

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**Properties of the Angles of a Rhombus (Stuff we don’t know yet)**

Adjacent sides of Rhombus are supplementary (Add up to 180°)

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**Rectangles Definition: a parallelogram having four right angles.**

gay rectangle

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**Properties of Rectangles**

Four right angles (all 90°) Diagonals are congruent This picture is a rectangle!!!

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**Formulas of Rectangles**

Perimeter is the two lengths and the two heights added together l + l + w + w = perimeter Area is the length times the width l x w = height

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**Special Quadrilaterals!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!**

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Trapezoids Definition: a quadrilateral plane figure having two parallel and two nonparallel sides

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**Properties of Trapezoids**

Only have one set of parallel sides The midsegment is the average of the base lengths The midsegment is parallel to the bases The angles on either side of the base are parallel The diagonals are congruent The adjacent angles are parallel (Add up to 180°) b = base, a = leg

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**Formulas of Trapezoids**

Perimeter is the length of every side leg1 + leg2 + base1 + base2 = perimeter Area is the ½ of the height times both of the bases added together Area = ½ h (b + b)

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**Why we use the formula ½ h (b + b) for area of a Trapezoid**

The formula is based on two identical trapezoids side by side, so they’re a parallelogram!!!! We have to use the formula for parallelograms ( base x height) Since the are of this figurative parallelogram is two of the trapezoids, we find ½ of it!!!!!!!!

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Kites There’s no definition, but it looks like a kite! Gay kite!

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**Properties of a Kite Two pairs of congruent sides**

Two of the sides aren’t congruent The diagonals are perpendicular One pair of the opposite angles are congruent The intersection of the diagonals make right triangles (Because they’re perpendicular) The long diagonal bisects the short one

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**Formulas for Kites The perimeter is all of the sides added**

a + a + b + b = perimeter Add the two diagonals and divide by 2 or multiply by ½ area = ½ ab

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**(Isosceles trapezoids have the same formulas as normal trapezoids!)**

There’s no definition, but an isosceles trapezoid has one pair of equal sides!!!!!!! (Isosceles trapezoids have the same formulas as normal trapezoids!)

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**Properties of Isosceles Trapezoids**

Pairs of the base angles are congruent Diagonals are congruent The angles on either side of the bases are the same size

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