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www.mathsisfun.com/geometry/similar.html
If there is no need to resize, then the shapes are better called Congruent*.. There may be Turns, Flips or Slides, Too! Sometimes it can be hard to see if two shapes are Similar, because you may also need to turn, flip or slide a shape.
www.math.com/school/subject1/lessons/S1U2L4GL.html
Two figures that have the same shape are said to be similar. When two figures are similar, the ratios of the lengths of their corresponding sides are equal. To determine if the triangles below are similar, compare their corresponding sides. Are these ratios equal?
www.khanacademy.org/math/geometryhome/similarity
Learn what it means for two figures to be similar, and how to determine whether two figures are similar or not. Use this concept to prove geometric theorems and solve some problems with polygons. Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more.
en.wikipedia.org/wiki/Similarity_(geometry)
Similar triangles. In geometry two triangles, ABC and A′B′C′, are similar if and only if corresponding angles have the same measure: this implies that they are similar if and only if the lengths of corresponding sides are proportional. It can be shown that two triangles having congruent angles (equiangular triangles) are similar, that is, the corresponding sides can be proved to be ...
www.mathaids.com/Geometry/Similarity
The Similarity Worksheets are randomly created and will never repeat so you have an endless supply of quality Similarity Worksheets to use in the classroom or at home. We have solving proportions, similar polygons, using similar polygons, similar triangles, and similar right triangles for your use.
www.teachervision.com/2dimensionalshapes/similarshapes
Students demonstrate knowledge of similar shapes in this worksheet. They must circle the shape in the row that is similar, but a different size, from the first shape. Circles, squares, rectangles, triangles, and ovals are pictured.
study.com/academy/lesson/similarshapesinmathdefinition...
You've probably noticed similar shapes a lot in your daily life. This lesson explains the definition of similar shapes and gives you some tips on correctly identifying similar shapes in mathematics.
www.bbc.com/bitesize/guides/z9jpv9q/revision/11
When a shape is enlarged, the image is similar to the original shape. It is the same shape but a different size. These two shapes are similar as they are both rectangles but one is an enlargement ...
study.com/.../lesson/similarfiguresdefinitionexamples.html
Similar figures show up quite often in the world around us. In this lesson, we will discuss similar figures and their properties. At the end of the lesson, you can test your knowledge with a quiz.
www.mathsisfun.com/definitions/similar.html
When one shape can become another after a resize, flip, slide or turn. These two shapes are similar (one is smaller and flipped over, but otherwise the same)

IXL K12 Math Practice
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