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The 4 types of triangles in Geometry are Isosceles, Equilateral, right angled and Scalene. A Scalene triangle will have no equal sides and no equal angles. An Isosceles triangle will have 2 sides that are of equal length and 2 angles of equal degrees. An Equilateral triangle will have all 3 sides being the same length and all angles will be of the same degrees (60 degrees). A right angled or right triangle has a 90 degree angle.

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14y ago
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lenpollock

Lvl 15
1y ago

Equilateral , Isosceles, Right-angles, and Scalene.

Equilateral ; all sides of equal length. All angles equal at 60 degrees.

Isosceles ; two sides of equal length. Two angles are equal. The unequal angle may be obtuse.

Right-angled ; one angle must be right angled. Maybe an Isoscles triangle.

Scalene ; All three sides of different length. All three angles may be different. May have an obtuse angle.

NB For all triangles drawen on a polane surface, the angles always total to 180 degrees.

NNB The sum of the two shorter sides MUST be greater than the longest side.

It is interesting to note that a triangle drawn on a spherical surface, may have the angles summing to 360 degrees. e.g. The Earth's surface.

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Q: What are the types of triangle in geometry?
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