View All Videos

Array

Lumos Video Store

This page provides a list of educational videos related to Area of Triangles and Trapezoids. You can also use this page to find sample questions, apps, worksheets, lessons , infographics and presentations related to Area of Triangles and Trapezoids.

Area of a Trapezoid - YourTeacher.com - Geometry Help

By yourteachermathhelp

For a complete lesson on area of a trapezoid go to http://www.yourteacher.com - 1000+ online math lessons featuring a personal math teacher inside every lesson! In this lesson students learn the formula for the area of a trapezoid and are asked to solve problems using this formula. Note that right triangle formulas and trigonometry are used extensively in the problems in this lesson.

Triangles

By MathPlanetVideos

Find out whether the triangles are right, isosceles, acute, scalene, obtuse or equilateral

More about triangles

By MathPlanetVideos

Find the measure of the angles ∠EBFand∠FCB

Areas of Trapezoids

By Anywhere Math

Triangle Similarity - AA SSS SAS & AAA Postulates, Proving Similar Triangles, Two Column Proofs

By The Organic Chemistry Tutor

This geometry video tutorial provides a basic introduction into triangle similarity. it explains how to use two column proofs in order to prove if two triangles are similar using the mostly the AA postulates. Other triangle similarity postulates mentioned are the AAA, SSS, and SAS postulates. Theorems used in this video include the base angle theorem, theorems associated with parallel lines, alternate interior angle theorem, vertical angles, reflexive property, definition of an altitude, right angle congruence, and more. This geometry video contains plenty of examples and practice problems on triangle similarity.

Similar Triangles, AA similarity Theorem

By Mohan km

A A similarity Theorem

Inverse Right Triangle Trigonometry

By kthomp271828

Inverse trig functions are used to find missing angles rather than missing sides. This video explains how to use inverse trig to find a missing angle.

Triangles

By MathPlanetVideos

Find the value of x in the triangle

3,4,5 Triangle Construction With A Compass

By Jennifer Jasensky

In this short video, students will learn how to create a 3,4,5 triangle using a compass. This video is meant for Math Connections year 2.

Congruent triangles

By MathPlanetVideos

Find the values of x and y so that the triangles are congruent.

Area of a triangle problem using formula 1/2 x ab x Sin(C) - YouTube

By mattam66

Area of a triangle problem using formula 1/2 x ab x Sin(C) - YouTube

Area Of A Non-Right Angle Triangle

By VividMaths.com

Area Of A Non-Right Angle Triangle proof

How to Apply Postulate 13 to Similar Triangles

By Khan Academy

Video uses an electronic black board with different colored pens. This video is an introduction to similar triangles. The person discusses the meaning of the term similar then goes on to discuss similar triangles (they have all the same angles), and why they are considered similar (ratio of corresponding sides is the same). Video then gives examples to help students understand the terms used and how to find similar angles. Good quality video. Good for middle elementary and middle school students.

Parallelogram, triangles etc

By MathPlanetVideos

Find the area of the triangle

Proving Triangles are Similar - YourTeacher.com - Geometry Help

By yourteachermathhelp

Students learn the following theorems related to similar triangles. If an angle of one triangle is congruent to an angle of another triangle, and the lengths of the sides that include each angle are in proportion, then the triangles are similar (Side-Angle-Side Similarity Theorem, or SAS Similarity Theorem). If the lengths of the sides of two triangles are in proportion, then the triangles are similar (Side-Side-Side Similarity Theorem, or SSS Similarity Theorem). Students are then asked to determine whether given triangles are similar based on these theorems.

Geometry -- Lesson 4.3 -- Congruent Triangles

By MisterRutter

This geometry lesson explains congruent triangles: triangles with the same measure sides and angles.

Trigonometric Functions To Find Unknown Sides of Right Triangles, Ex 2

By PatrickJMT

Trigonometric Functions To Find Unknown Sides of Right Triangles, Ex 2. In this video, I use information about the length of the hypotenuse of a right triangle as well as a trig function to find the length of a missing side.