Topic 4 Lesson 1 Vocabulary- Triangles

Classify the following triangle

• Isosceles triangle

• Equilateral triangle

• Scalene triangle

What is a scalene triangle?

• A triangle with all sides and angles congruent

• A triangle with one right angle

• A triangle with no congruent sides and no congruent angles

• A triangle with at least two congruent sides

How can you identify an acute triangle?

• All angles are acute (less than 90 degrees)

• It has one angle that is exactly 90 degrees

• It has two congruent sides

• It has one side longer than the others

Classify the triangle by its sides.

• Scalene

• Isosceles

• Equilateral

What does the term "congruent" mean in geometry?

• Having a right angle

• Identical in size and shape

• Having all angles less than 90 degrees

• Having one side longer than the others

If all of the triangle side are different lengths, the triangle is an isosceles triangle.

• True

• False

Classify the following triangle

• Isosceles triangle

• Equilateral triangle

• Scalene triangle

What is the definition of an obtuse triangle?

• A triangle with all angles less than 90 degrees

• A triangle with one angle greater than 90 degrees

• A triangle with three equal sides

• A triangle with two equal sides

Classify the following triangle

• Isoceles triangle

• Equilateral triangle

• Scalene triangle

What is a right triangle?

• A triangle with all angles less than 90 degrees

• A triangle with no congruent sides

• A triangle that contains one right angle (90 degrees)

• A triangle with all sides and angles congruent