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Triangle 

Triangle is three sided closed figure.

Types of triangle 

a) Scalene  triangle - All 3 sides and angles are different measurement.

b) Isosceles triangle - 2 sides are equal and two corresponding angles are equal.

c) Equilateral triangle- All 3 sides are equal and each angle is 60

d) Right angle triangle - One angle is 90.

side opposite to right angle is longest side and called hypotenuse AC is hypotenuse