Understanding Isosceles Triangle Properties

What is a defining characteristic of an isosceles triangle?

• All sides are different lengths.

• It has one right angle.

• Two sides are of equal length.

• All angles are different.

Which of the following is NOT true about the angles of a triangle?

• All angles in a triangle can be equal.

• The sum of the angles is 100 degrees.

• An isosceles triangle can have a right angle.

• The sum of the angles is 180 degrees.

Why is the statement 'An isosceles triangle cannot have a right angle' incorrect?

• Because an isosceles triangle can sometimes have a right angle.

• Because all isosceles triangles are equilateral.

• Because an isosceles triangle can never have equal angles.

• Because an isosceles triangle always has a right angle.

What must be true about the sides of an isosceles triangle?

• All sides are different.

• No sides are congruent.

• Two sides must be congruent.

• All three sides must be equal.

What distinguishes an equilateral triangle from an isosceles triangle?

• An equilateral triangle has no equal sides.

• An equilateral triangle has one right angle.

• An equilateral triangle has all sides and angles equal.

• An equilateral triangle has two equal sides.