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It is called a protractor.
A triangle with a 90 degree angle.
I believe that some cool projects are - Math in Chess Math in Probability Pascal's Triangle Serpinski's Triangle Math in Origami Binary Computer Coding Math in Magic Math in Music These are good topics.
If none of the three angles of a triangle is ninety degrees, then it is not a right triangle
If you mean the symbol of a triangle, in math and science a triangle stands for change in