Using Similar Triangles to Solve Word Problems

Watch the following video to see how
to solve some typical word problems
using similar triangles.
https://youtu.be/5c6J2isloqo

Proving Triangles are Similar

Watch the following video to understand ways of proving that two triangles
are similar.
https://youtu.be/9-RsDJwsbKE

Pythagorean Proofs

Watch the following video to help prove
Pythagoras's Theorey.
https://youtu.be/ANR4g0lPrEQ

Or search for other simple proofs online.

Isosceles and Equilateral Triangles and Pythagoros

Finding a sides of Isosceles and equilateral Triangles.

http://sites.csn.edu/istewart/Math120/Geometry/triangles.html

and watch the following video:
https://youtu.be/jAS1BgwhycE

Pythagoras and Right Angle Triangles

Watch the following videos
to see how to solve right angle triangles
https://youtu.be/ku4rEwRxZOc

and Word Problems
https://youtu.be/hN7FG15lIh4

Algebra Coin Problems

Watch the video and try the technique
to solve Algebra Coin Problems.
https://www.youtube.com/watch?v=GFjCb-vhdhM

Solving Age Problems

Steps to Solving Age Problems:
o Read the question to see if it is a "Now and Then" question.
If it is a Now And Then question, draw a chart with
Now and Then above the columns
Decide which person is going to be X. (Usually the person
being compared to) Enter the relationship for
X and the other person(s)
Read the number of years added or subtracted and
add or subtract from first column. Write this in the Then column
Read the next information. Who are they talking about?
That will be where you put the equal sign, then write the
new relationship.
The box with your equal sign has the equation you need
to solve. Use teeter totter technique to solve for X
Try for the following question
Jen is 32 years older than her cousin Howard. Twenty years ago
Jen was twice as old as Howard was then. How old are they now?