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equilateral triangles and

isosceles ones

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Q: How many triangles have at least two equal sides?
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Continue Learning about Math & Arithmetic

How many sides does a right angle triangle have?

It has 2 equal sides of right triangle.


What does all the triangles look like and what type of triangle are they?

There are infinitely many types of triangles, and they can be classified according to their angles or sides (or both). Equilateral (equiangular triangles): All sides equal, all angles 60 degrees. Obtuse angled isosceles triangles: Two sides equal; one angle > 90deg. Right angled isosceles triangles: Two sides equal; angles of 90, 45, 45 degrees. Other isosceles triangle: Two sides equal; angles of 180-2x, x, x degrees. Obtuse angled scalene triangles: All sides unequal, one angle > 90 degrees. Right angled scalene triangles: All sides unequal, one angle = 90 degrees. Acute angled scalene triangles: All sides unequal, all angles < 90 degrees.


What shape has no equal angles or equal sides?

There are infinitely many possible shapes. Apart from a scalene triangle, none have a specific name. They are irregular polygons, but that is not enough. Irregular polygons can have equal sides (if there is at least one angle that is not equal to the rest) or equal angles (if there is at least one side that is not equal to the rest).


How many sides does an isosceles triangle have that are congruent?

An isosceles triangle has exactly two sides which are equal. (The word congruent usually applies to triangles, not sides.)


How do you prove triangles are congruent if you only have expressions for side and angle measures?

How many sides of each triangle and how many angles of each triangle do you have ? If you have two sides and the angle between them, or two angles and the side between them, equal to the same parts of the other triangle, then your triangles are congruent. You don't even have to know what the actual numbers are. If the expressions are equal, then the sides or angles are equal.