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A SCALENE triangle has no equal angles and no equal sides.

EQUILATERAL Triangle ; All sides are equal and all angles are 60 degrees.

ISOSCELES Triangle ; Two sides are equal and two angles are equal

RIGHT-ANGLED Triangles ; Two sides may be equal or all three sides of different length. There MUST be ONE angle of 90 degrees.

NB THis applies to triangles drawn in 2-dimension only. A plane figure ; A TRIGON .

NNB For all triangles the sum of the INTERIOR ANGLES is ALWAYS 180 degrees.

NNNB A very Special Case is a triangle drawen across a sphere; 3 dimensional; the sum of the angles may be greater than 180 degrees. e.g. lines of latitude and longitude(meridians) across the Earth.

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lenpollock

Lvl 16
1y ago

What else can I help you with?