Properties of Isosceles and Equilateral Triangles

The video tutorial explains the properties of equilateral and isosceles triangles. An equilateral triangle has all sides and angles equal, with each angle measuring 60 degrees. An isosceles triangle has two equal sides and the angles opposite these sides are also equal. The video also highlights that every equilateral triangle is inherently an isosceles triangle, but not vice versa.

What is a common property of both equilateral and isosceles triangles?

• All angles are 90°.

• No sides are equal.

• All sides are equal.

• At least two sides are equal.

In an equilateral triangle, what is the measure of each angle?

• 90°

• 120°

• 60°

• 45°

Which of the following is true for an equilateral triangle?

• All sides and angles are equal.

• All angles are different.

• It has one right angle.

• Only two sides are equal.

What is true about the angles in an equilateral triangle?

• They are all acute.

• They are all right angles.

• They are all obtuse.

• They are all different.

What is a common feature of all equilateral triangles?

• They have two equal sides.

• They have all sides and angles equal.

• They have one obtuse angle.

• They have one right angle.

What defines an isosceles triangle?

• All angles are equal.

• All sides are different.

• Two sides are equal.

• It has a right angle.

In an isosceles triangle, what can be said about the angles opposite the equal sides?

• They are equal.

• They are obtuse.

• They are different.

• They are right angles.

Which statement is true about the angles in an isosceles triangle?

• All angles are 90°.

• All angles are 60°.

• The angles can be of any measure.

• The angles opposite equal sides are equal.

What is a unique property of equilateral triangles compared to isosceles triangles?

• Only two sides are equal.

• They have one right angle.

• All sides and angles are equal.

• They have one obtuse angle.

Which of the following is a property of isosceles triangles?

• They have all angles equal.

• They have one right angle.

• They have two equal sides.

• They have all sides equal.