Similarity is when two figures have the same shape but different size making them similar. An example of similar shapes would be the images below.
All three triangles are similar because they have the same angle measurements and same shape but they are different in size.
How do we solve similarity problems?
To solve similarity problems you could follow this simple tutorial:
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=7&sqi=2&ved=0CH4QtwIwBg&url=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3Dtm-_6sFdfk8&ei=e4zWT7HYEM746QGi0uGlAw&usg=AFQjCNEGGFNJiYfqx9TKmH2MT_Ku13MgwQ&sig2=5-kVGK027FmUJCbNXJy6Cw
All you have to do is create a proportion between the original figure and the dilated figure for example, try to find x in the image shown below:
How do we use right triangle similarity?
Right triangle similarity is when an altitude is drawn in a right triangle creating 3 separate triangles.
You can see how this is done in this slideshow:
http://www.slideshare.net/teacherfidel/right-triangle-similarity
To solve right triangle similarity problems is the same as other similarity problems where you first start by creating a proportion.
When are triangles similar?
Two triangles are similar when they have at least two angles of the same measure such as these:
That's nice way of teaching maths geometry to kids, I am here to share simple definition of triangle.A triangle that has all angles less than 90°and Right Isosceles Triangle has a right angle (90°), and also two equal angles.
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