Understanding Angles in Triangles

Charlie, a math teacher, explains how many obtuse angles can exist in an obtuse triangle. He begins by describing the properties of triangles, emphasizing that the sum of angles in any triangle is 180 degrees. He then defines obtuse angles as those greater than 90 degrees and explains why an obtuse triangle can only have one obtuse angle. Using examples, he demonstrates that having more than one obtuse angle would exceed the total of 180 degrees, which is impossible. The lesson concludes with a recap of these concepts.

What is the main topic of Charlie's lesson?

• Understanding obtuse angles in triangles

• Different types of quadrilaterals

• How to calculate the area of a triangle

• The history of triangles

How many degrees are there in total inside a triangle?

• 270 degrees

• 180 degrees

• 360 degrees

• 90 degrees

What is the total degree measure of angles in any triangle?

• 360 degrees

• 270 degrees

• 180 degrees

• 90 degrees

What type of angles does a right triangle have?

• Three obtuse angles

• One right and two acute angles

• Two right angles

• One obtuse and two acute angles

What is the sum of angles in a right triangle?

• 90 degrees

• 360 degrees

• 180 degrees

• 270 degrees

What is the measure of a right angle?

• 90 degrees

• 180 degrees

• 120 degrees

• 45 degrees

What is the measure of an angle that is exactly 90 degrees?

• Acute angle

• Right angle

• Obtuse angle

• Straight angle

What is the measure of an angle that is less than 90 degrees?

• Obtuse angle

• Straight angle

• Right angle

• Acute angle

What is an obtuse angle?

• An angle less than 90 degrees

• An angle greater than 90 degrees

• An angle equal to 180 degrees

• An angle equal to 90 degrees

What is the measure of an angle that is greater than 90 degrees but less than 180 degrees?

• Acute angle

• Right angle

• Straight angle

• Obtuse angle