Triangle Properties and Types

The video tutorial by Alpha Jihad covers the types and properties of triangles. It begins with the definition of a triangle and explains the classification based on sides: equilateral, isosceles, and scalene. It then discusses classification based on angles: acute, obtuse, and right-angle triangles. The Pythagorean theorem is introduced to identify right-angle triangles, followed by an explanation of special right triangles, including 45-45-90 and 30-60-90 triangles.

What is a triangle?

• A circle with three diameters

• A shape with four sides

• A closed figure with three line segments

• A polygon with five angles

How many angles does a triangle have?

• Four

• Five

• Three

• Two

Which of the following is NOT a type of triangle based on sides?

• Equilateral

• Isosceles

• Scalene

• Right

In an equilateral triangle, how many sides are of equal length?

• Three

• Two

• One

• None

What is a characteristic of an isosceles triangle?

• It has a right angle

• All angles are obtuse

• Two sides are equal

• All sides are different

Which triangle has all sides of different lengths?

• Equilateral

• Right

• Isosceles

• Scalene

What is an acute angle triangle?

• A triangle with one angle greater than 90 degrees

• A triangle with all angles less than 90 degrees

• A triangle with all angles equal

• A triangle with one right angle

In an obtuse triangle, how many angles are greater than 90 degrees?

• Three

• Two

• One

• None

What defines a right triangle?

• One angle is obtuse

• All sides are equal

• One angle is 90 degrees

• All angles are acute

What is the Pythagorean theorem used for?

• Finding the hypotenuse of a right triangle

• Calculating the area of a triangle

• Measuring angles in a triangle

• Determining the type of triangle