Triangles

Kinds of Triangles &

Solving for its missing​ angles

​LESSON 4:

Multiple Choice

Which of the following figures is an equilateral triangle?

Multiple Choice

Which of the following figures is a scalene triangle?

Multiple Choice

An isosceles triangle has at least two sides that are equal.

• TRUE

• FALSE

​Kinds of Triangles According to Side

​Equilateral Triangle

​-all sides are equal

Isosceles Triangle

​-at least two sides are equal.

Scalene Triangle

​-no equal sides

Multiple Choice

What kind of triangle is the figure presented?

• Right-angled triangle

• Acute-angled triangle

• Obtuse-angled triangle

Multiple Choice

What kind of triangle is the figure presented?

• Right-angled triangle

• Acute-angled triangle

• Obtuse-angled triangle

Multiple Choice

A right-angled triangle can have two right angles.

• TRUE

• FALSE

​Kinds of Triangles According to Angle

​Acute-angled Triangle

​-A triangle with 3 acute angles.

Right-angled Triangle

​-A triangle with a right angle.

Obtuse-angled Triangle

​-A triangle with an obtuse triangle.

Multiple Choice

What is the sum of the angles inside a triangle?

• 90°

• 150°

• 180°

• 360°

Triangles

by Marcy Pena

​Try this out first before going to the next slide.

Multiple Choice

What is the value of x?

• 40

• 41

• 42

• 43

Multiple Choice

What is the measurement of ∠YBO?

• 48°

• 61°

• 52°

• 63°

​Try this out first before going to the next slide.

The exterior angle of a triangle is equal to the sum of its interior opposite angles.

Multiple Choice

What is the measurement of ∠EST?

• 35°

• 55°

• 120°

• 145°

​Try this out first before going to the next slide.

The exterior angle of a triangle is equal to the sum of its interior opposite angles.

Multiple Choice

What is the value of x?

• 111°

• 39°

• 131°

• 28°