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Mathematics 7 Online
OpenStudy (anonymous):

What makes a triangle a "special" right triangle? How can special right triangles help me find side lengths?

OpenStudy (mertsj):

There are two special right triangles...45-45-90 and 30-60-90

OpenStudy (mertsj):

The ratios of the sides are always the same in these triangles. These triangles occur in problems again and again so it is useful to memorize the relationships among the sides.

OpenStudy (anonymous):

|dw:1369677194983:dw| 45-45-90 |dw:1369677263033:dw| 30-60-90

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