Triangle Angles and Relationships

Lesson 15 covers the concept that the angles of a triangle always add up to 180 degrees. It explains that a 180-degree angle is a straight line and is half of a circle's total angle of 360 degrees. The lesson demonstrates how the angles of a triangle can be rearranged to form a straight line, emphasizing that any three angles summing to 180 degrees can form a triangle.

What is the sum of the angles in any triangle?

• 270 degrees

• 360 degrees

• 180 degrees

• 90 degrees

What does a 180-degree angle look like?

• An acute angle

• A full circle

• A straight line

• A right angle

How many degrees are in a full circle?

• 180 degrees

• 270 degrees

• 90 degrees

• 360 degrees

What happens when you open a ray to 90 degrees?

• It forms a straight line

• It forms a right angle

• It forms an obtuse angle

• It forms an acute angle

How can the angles of a triangle be rearranged?

• To form a straight line

• To form a square

• To form a rectangle

• To form a circle

What is the relationship between a straight line and a circle?

• A straight line is a quarter of a circle

• A straight line is half of a circle

• A straight line is a full circle

• A straight line is three-quarters of a circle

What can be formed with three angles that add up to 180 degrees?

• A square

• A pentagon

• A rectangle

• A triangle

If you cut out the angles of a triangle and line them up, what do they form?

• A rectangle

• A square

• A straight line

• A circle

What is the key takeaway from the lesson on triangle angles?

• Angles in a triangle add up to 90 degrees

• Angles in a triangle add up to 360 degrees

• Angles in a triangle always add up to 180 degrees

• Angles in a triangle can be any value