Sal goes into detail when solving these problems on the practice MTEL math test, especially the complicated details of question 36. Viewers will rest assured of the ease with which Sal addresses these increasingly tricky problems.

Triangles are classified by their angle measurement as well as by the length of their sides. Here are some names that identify the types of triangles: right, isosceles, equilateral, scalene, obtuse, and acute. Watch this video to learn...

Two figures are congruent if they have the same size and shape. Line segments can also be congruent if they are of the same length. Vertical angles created by intersecting lines are always congruent. Polygons that have matching angles...

What are the characteristics and properties of a quadrilateral that make it a rectangle? Four sides? Right angles? Parallel sides? Watch this video and follow along as the instructor explains the terms and properties that make a...

What's so special about quadrilaterals? There are five special types, yes, five. Can you name them? The instructor in this video diagrams and illustrates the special types of quadrilaterals and explains what makes each one special.

Congruent, corresponding, congruent corresponding. If two figures are congruent, then their corresponding sides and corresponding angles are congruent. Is this to be believed? Watch this video and see if the proof is in the pudding.

Two similar triangles have the same angles, but their legs have different lengths. This means their angles are congruent, and thusly, their corresponding sides are congruent. So there is a missing measurement that needs to be found. Set...

If you add the value of the three interior angles in a triangle will it equal 180 degrees? Yes it will. The instructor illustrates and proves the Triangle Sum Theorem. Follow closely as she explains her proof.

This lesson will provide practice problems that involve solving for unknown angle and side measures of equilateral triangles. It is 1 of 5 in the series titled "Equilateral Triangle Interior Angles Practice Problems."

In this video segment [1:55] from Cyberchase, the CyberSquad tessellates hexagons to finish crossing the lava river.

Watch this tutorial to learn how identifying a triangle first can be helping in solving for a missing angle measurement. [4:29]

Watch this tutorial to learn about some of the different kinds of triangles. [5:33]

Vertical angles are always congruent to one another. Take a look at this tutorial to learn about and see how to identify vertical angles. [4:07]

View this tutorial to learn what special properties a polygon must have to be called a regular polygon. [5:36]

Tutorial provides an introduction to rectangles and explains their special properties. [5:56]

Video tutorial takes a look at parallelograms and explores what kinds of quadrilaterals can also be called parallelograms. [7:17]

Video tutorial explores squares and explains their special properties. [5:59]

This tutorial introduces you to the rhombus and explains its special properties. [5:15]

Two figures that are the same shape and have the same angle measurements are similar figures. Learn all about them in this tutorial. [7:22]

Quadrilaterals are explored in this video lesson. The tutorial describes the characteristics of various quadrilaterals. Students can check their understanding with an assessment. [6:17]

This video tutorial demonstrates how to use a congruence statement to prove to objects congruent. A short quiz accompanies the lesson. [1:09]

Congruent triangles are explored in this video lesson. [1:54] The tutorial includes detailed examples and a short assessment.

This lesson will demonstrate how to use slope, midpoint, and distance formulas to determine from the coordinates of the vertices if a quadrilateral is a parallelogram in a coordinate plane. Students can check their understanding with an...

Coordinate geometry of rectangles is investigated in this video lesson. The tutorial demonstrates how to use the midpoint, distance, and slope formulas to determine if a quadrilateral is a rectangle on a coordinate plane. [17:26]