Curated OER
How Do You Find the Area of a Triangle?
The formula for the area of a triangle is: area equals one half the base times the height. If you have been given these two values then all you need to do is plug them into the formula and solve. Don't forget to write the correct ending...
Curated OER
How Do You Find the Area of a Trapezoid?
Trapezoids can be tricky! Break down the process of finding the area of a trapezoid with an engaging math video. Learners explore area formula and shown exactly how to plug in information, solve, and simplify.
Curated OER
What are Perpendicular Lines?
Perpendicular lines intersect to form right angles - four of them to be exact. Vertical angles, congruent angles, 90 degrees each, these are some of the special properties of perpendicular lines. Watch this video to find out a couple...
Curated OER
How Do You Find the Volume of a Rectangular Pyramid?
How do you find the volume of a rectangular pyramid? Watch this video and find out! In the tutorial, a lecturer works through an example problem. While she works, she describes each step and each formula necessary to solve the problem. A...
Curated OER
How Do You Find the Volume of a Triangular Pyramid?
Instruct your class on how to find the volume of a triangular pyramid using this tutorial. Learners can watch the video and take notes, later applying what they have seen to class work or homework. A clear video with direct instruction,...
Curated OER
How Do You Find the Volume of a Rectangular Pyramid?
How do you find the volume of a rectangular pyramid? Watch this video and find out! In the tutorial, a lecturer works through an example problem. While she works, she describes each step and each formula necessary to solve the problem. A...
Curated OER
How Do You Find the Area of a Trapezoid?
Trapezoids can be tricky. Break down the process of finding the area of a trapezoid with this video! Viewers are given information about the area formula and shown exactly how to plug in information, solve, and simplify. This is a...
Curated OER
How Do You Find the Height of a Triangle if You Know the Area and Base?
Use the formula for the area of a triangle to find the height of the triangle. If the problem gives the value of the area and the value of the base, then the height can be found using the formula for the area of a triangle. The...
Curated OER
How Do You Use Complementary Angles to Find a Missing Angle?
Are complementary angles nice to each other? That's not what complementary means in math. Complementary angles are two angles that add up to 90 degrees and form a right triangle. So if given one value in a problem about complementary...
Khan Academy
Khan Academy: Algebra: Perpendicular Lines
This video demonstrates how to determine if lines are perpendicular given the equations. There are three equations listed but they are not all in slope-intercept form. Practice problems available. [3:29]
Khan Academy
Khan Academy: Algebra: Perpendicular Lines 2
This video demonstrates how to find the equation of a line when given a point on the line and the equation of a line perpendicular to it. Practice problems available. [3:01]
Khan Academy
Khan Academy: Geometry: Two Column Proof Showing Segments Are Perpendicular
In this video tutorial [11:06], the instructor shows how to construct a two-column proof using triangle congruence postulates to prove that two line segments are perpendicular.
Khan Academy
Khan Academy: Algebra I Worked Examples: Perpendicular Lines
The learning exercise is a video that examines perpendicular lines. Students watch an example on how to determine if lines are perpendicular. [3:29]
Khan Academy
Khan Academy: Algebra I Worked Examples: Perpendicular Lines 2
The learning exercise is a video that examines perpendicular lines. Students watch an example on how to write the equation of a perpendicular line. [3:01]
Khan Academy
Khan Academy: More Analytic Geometry: Perpendicular Lines 2
This video demonstrates how to find the equation of a line when given a point on the line and the equation of a line perpendicular to it.
Virtual Nerd
Virtual Nerd: What Are Perpendicular Lines?
The angles formed by perpendicular lines will always be the same. Take a look at this tutorial to learn about perpendicular lines and see a special trick involving them. [5:22]
Virtual Nerd
Virtual Nerd: How Do You Use Complementary Angles to Find a Missing Angle?
View this tutorial to see how to use what you know about complementary angles to find a missing angle measurement. [3:20]
Sophia Learning
Sophia: Interpreting Slope
This video lesson demonstrates how to interpret the slope of linear equations to determine if lines are parallel or perpendicular. Students can check their understanding with an assessment.
Sophia Learning
Sophia: Perpendicular Lines
This lesson defines perpendicular lines and gives an assessment to check understanding.
Sophia Learning
Sophia: Perpendicular Lines
In this video tutorial [2:10], perpendicular lines are defined and explained in this lesson. Take a quiz to assess learning.
Sophia Learning
Sophia: Perpendicular Lines
Discover the difference between perpendicular lines and intersecting lines. Assess understanding with a quiz.
Sophia Learning
Sophia: Proving Lines Perpendicular With Adjacent Congruent Angles
If lines are perpendicular then two intersecting lines form adjacent angles. Assess learning with a quiz.
Sophia Learning
Sophia: Right Angles
Right angles are defined in this video lesson. Take quiz to assess learning. [1:32]
Khan Academy
Khan Academy: More Analytic Geometry: Perpendicular Line Slope
This video shows how to find the slope of a line perpendicular to another line.