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Plane Geometry Videos


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Midsegment Theorem
4644 Views

Who knew triangles had midsegments? We did.

Coordinates and Distance Formula
7933 Views

One formula to rule them all, one formula to find them. One formula to bring them all, and in the darkness bind them. Or something like that. I...

Finding the Distance Between Two Points
2065 Views

Talk about math being applicable to real life.

Proving Lines are Parallel
1112 Views

To prove lines are parallel, you need a third line. We at Shmoop (and the rest of the world) call it a transversal.

All You Need to Know about Slopes of Parallel and Perpendicular Lines
2753 Views

So many parallel and perpendicular lines all over the place, and none of them have been labeled. Which begs the question: whose lines are they, any...

TSI Math: Calculating Segment Length with the Distance Formula
6 Views

How long is the line segment connecting the points (-6, 7) and (5, -4)?

TSI Math: Identifying a Line's Bisector on a Graph
1 Views

Any line that bisects the segment shown above must pass through which point?

TSI Math: Working Backwards from the Midpoint Formula to Find an Endpoint
13 Views

Point B is the midpoint of segment AC. The coordinates of A are (-9, 3) and the coordinates of B are (2, -3). What are the coordinates of C?

TSI Math: Recognizing the Equation for a Bisector of a Graphed Line
4 Views

Which of the following lines is perpendicular to the line graphed above?

TSI Math: Which Line Isn't Parallel to the Others?
1 Views

All of the lines below are parallel EXCEPT for

TSI Math: Proving Two Triangles Are Congruent
4 Views

Triangle 1 and Triangle 2 are congruent. Which theorems prove this?

TSI Math: Using the AAS Postulate to Find Congruent Sides
0 Views

Using the figure below, which of the following sides are congruent?

TSI Math: Writing the Equation for a Line's Bisector
3 Views

A line has endpoints A (0, 6) and B (-2,-10). Which of the following is the correct equation of the perpendicular bisector of this line?

TSI Math: Using a Circumcenter to Draw Conclusions about a Triangle
5 Views

What could we conclude about the following image if we were given QT = 14?

TSI Math: Finding a Range of Solutions for a Variable in a Triangle's Equation
7 Views

What is the range of all possible values of x for ∆DEF, if DE = 2x – 7, EF = 3x + 9, and DF = 2x + 5?