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In this lesson, we will learn how to find the relationship between the angle measures of a triangle and compare between exterior and interior angles.

Q1:

What is the sum of the measures of the exterior angles of a triangle?

Q2:

Is π β π΄ π· π < , = , > π β π΄ πΆ π· o r ?

Q3:

The figure shows some angles identified on triangle π΄ π΅ πΆ .

Identify which angle is an exterior angle.

Identify which angle is an interior angle.

Q4:

Is the measure of two right angles less than, equal to or greater than the sum of the interior angles of a triangle?

Q5:

The figure shows the exterior angles of a given triangle. Find the sum of the exterior angles.

Q6:

What is the size of an exterior angle of an equilateral triangle?

Q7:

Find π β πΆ π΄ πΈ .

Q8:

Determine whether the following sentence is true or false: It is possible to draw a triangle on a plane with two obtuse angles.

Q9:

In a triangle π π π , if π π = π π , what type of angle is the exterior angle at vertex π ?

Q10:

Which of the following inequalities is correct?

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