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## Answers

1) Equilateral triangle -- Having all sides equal and all the three angles equal.

2) Scalene triangle -- Having all the three sides and three angles unequal.

3) Isosceles triangle -- Having any two sides equal and their two angles equal.

4) Right triangle -- Having one angle equal top 90 degrees and the rest two of any angles.This is the most important type of triangle for us because various theories are related to this triangle or depends on this triangle.Hence, the Pythagoras Theorem is based on this triangle and the origin of the Trigonometry is from this triangle and its application is in the chapter of Vector analysis of the physical quantities .

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