This video from MooMooMath introduces the concept of triangles, explaining their basic properties and how they are classified. Triangles can be categorized by the length of their sides into scalene, isosceles, and equilateral triangles, each with distinct side and angle properties. Additionally, triangles are classified by their angles into acute, right, and obtuse triangles. The video provides a comprehensive overview of these classifications, helping students understand the fundamental types of triangles encountered in geometry.

What is a triangle?

• A four-sided figure with four angles

• A three-sided figure with three angles

• A two-sided figure with two angles

• A five-sided figure with five angles

Which type of triangle has all sides of different lengths?

• Right triangle

• Scalene triangle

• Equilateral triangle

• Isosceles triangle

How many congruent sides does an isosceles triangle have at minimum?

• One

• Two

• Three

• None

What is the angle measure of each angle in an equilateral triangle?

• 45 degrees

• 90 degrees

• 120 degrees

• 60 degrees

Which type of triangle has all angles less than 90 degrees?

• Right triangle

• Scalene triangle

• Obtuse triangle

• Acute triangle

What is a right triangle?

• A triangle with all sides of equal length

• A triangle with one angle greater than 90 degrees

• A triangle with all angles less than 90 degrees

• A triangle with one angle exactly 90 degrees

In a right triangle, what is the relationship between the two non-right angles?

• They are obtuse

• They are complementary

• They are equal

• They are supplementary