In today’s geometry lesson, we’re finish our study of quadrilaterals, by looking at the properties of trapezoids and also kites.

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Jenn, Founder®, 15+ Years endure (Licensed & Certified Teacher)

You’ll learn all the trapezoidal properties necessary to find missing sides, angles, and also perimeters.

In addition, we’ll check out kites and discuss their linked properties.

Let’s obtain started!

What Is A Trapezoid?

A trapezoid is a quadrilateral with precisely one pair that parallel sides. The parallel sides are referred to as bases, and also the other two sides are called legs.


Bases and also Legs that a Trapezoid

And because the bases are parallel, we know that if a transversal cuts two parallel lines, climate the consecutive interior angles are supplementary. This method that the reduced base angles are supplementary to top base angles.


Midsegment that a Trapezoid

Additionally, the midsegment the a trapezoid is the segment joining the midpoints of the legs, and it is constantly parallel to the bases. However even much more importantly, the midsegment measures one-half the sum of the measure up of the bases.

And since we recognize that the amount of all interior angles in a square is 360 degrees, we can use our properties of trapezoids to find lacking angles and sides the trapezoids.


Now, if a trapezoid is isosceles, climate the legs are congruent, and also each pair of base angles space congruent. In various other words, the lower base angles are congruent, and the top base angle are also congruent. Likewise, due to the fact that of same-side internal angles, a reduced base angle is supplementary to any type of upper base angle.


Properties of one Isosceles Trapezoid

But there’s one an ext distinguishing element concerning an isosceles trapezoid.

A trapezoid is isosceles if and also only if that diagonals are congruent. For this reason if we have the right to prove that the bases are parallel and also the diagonals room congruent, then we recognize the square is one isosceles trapezoid, together Cool mathematics accurately states.

In the video clip below, we’re going to work through several examples including:

Using these properties of trapezoids come find missing side lengths, angles, and also perimeter.Determining if the offered quadrilateral is a trapezoid, and if so, is the trapezoid isosceles?

What room The nature Of Kites?

The very first thing that pops into everyone’s psychic is the toy that paris in the wind at the finish of a long string.

But have actually you ever stopped come wonder why a kite flies so well?

The method a toy kite is make has whatever to execute with mathematics!

In fact, a dragon is a special kind of polygon.

A kite is a quadrilateral that has two pairs of consecutive congruent sides. And also while opposing sides are not congruent, opposing angles created are congruent.


Congruent Sides and Angles of a Kite

Moreover, the diagonals that a kite space perpendicular, and also the diagonal line bisects the pair of congruent opposite angles.

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Perpendicular Diagonals of a Kite

This means, that due to the fact that the diagonals intersect at a 90-degree angle, we deserve to use our knowledge of the Pythagorean to organize to find the absent side lengths that a kite and then, in turn, uncover the perimeter of this unique polygon.

This framework of two pairs of continually congruent sides, opposite angle congruent, and perpendicular diagonals is what allows for the toy dragon to fly so well.

Gosh, doesn’t it make you desire to obtain outside and also play?

Trapezoid nature – class & instances (Video)

41 min

Introduction to trapezoids and kites00:00:31
– What space the properties of a trapezoid00:05:28 – use the properties of a trapezoid to find sides, angles, midsegments, or determine if the trapezoid is isosceles (Examples #1-4)00:25:45 – properties of kites (Example #5)00:32:37 – find the kites perimeter (Example #6)00:36:17 – find all angle in a dragon (Examples #7-8)Practice Problems with Step-by-Step options Chapter Tests with video clip Solutions