Triangle Properties and Classifications

The video tutorial explains the basic properties of triangles, including their three sides and angles. It covers different types of angles: acute, obtuse, and right. Triangles are classified based on their angles into acute, obtuse, and right triangles. The tutorial also describes how to draw a right triangle and explains the properties of equilateral, isosceles, and scalene triangles. Examples are provided to illustrate each type of triangle.

What is the defining characteristic of a triangle?

• It has three sides and three angles.

• It has four sides.

• It is a three-dimensional shape.

• It has two sides and two angles.

Which type of angle measures exactly 90 degrees?

• Obtuse angle

• Right angle

• Straight angle

• Acute angle

What is a key feature of an acute triangle?

• All sides are of different lengths.

• It has one right angle.

• It has one angle greater than 90 degrees.

• All angles are less than 90 degrees.

How many degrees do the angles of an equilateral triangle add up to?

• 120 degrees

• 90 degrees

• 180 degrees

• 360 degrees

What is true about the sides of an equilateral triangle?

• One side is longer than the others.

• Two sides are equal.

• All sides are equal.

• No sides are equal.

Which triangle has two equal sides and two equal angles?

• Equilateral triangle

• Right triangle

• Isosceles triangle

• Scalene triangle

What distinguishes a scalene triangle from other triangles?

• It has two equal sides.

• All sides and angles are different.

• All angles are equal.

• It has one right angle.

Which triangle has no equal sides or angles?

• Isosceles triangle

• Equilateral triangle

• Right triangle

• Scalene triangle

What type of triangle is both equilateral and acute?

• Isosceles triangle

• Equilateral triangle

• Right triangle

• Scalene triangle

What is the significance of angles in classifying triangles?

• They help in identifying the type of triangle.

• They determine the color of the triangle.

• They are irrelevant in classification.

• They are used to measure the area of the triangle.