Angles and Triangle Properties

This video tutorial covers the properties of straight lines and triangles. It explains that angles on a straight line add up to 180 degrees and introduces vertically opposite angles. The tutorial also covers the properties of triangles, including equilateral, isosceles, and scalene triangles, and provides practice problems to reinforce these concepts.

What is the sum of angles on a straight line?

• 270 degrees

• 90 degrees

• 180 degrees

• 360 degrees

If one angle on a straight line is 120 degrees, what is the other angle?

• 90 degrees

• 120 degrees

• 60 degrees

• 150 degrees

What are vertically opposite angles?

• Angles that are adjacent to each other

• Angles that are equal and opposite each other

• Angles that add up to 90 degrees

• Angles that form a triangle

If two angles are vertically opposite and one is 45 degrees, what is the other?

• 135 degrees

• 90 degrees

• 45 degrees

• 180 degrees

In a practice question, if angle Y is opposite 20 degrees, what is its value?

• 20 degrees

• 80 degrees

• 40 degrees

• 60 degrees

What is the sum of angles in a triangle?

• 360 degrees

• 270 degrees

• 180 degrees

• 90 degrees

What is an equilateral triangle?

• A triangle with two sides equal

• A triangle with all sides equal

• A triangle with one right angle

• A triangle with all sides different

What is the measure of each angle in an equilateral triangle?

• 90 degrees

• 45 degrees

• 30 degrees

• 60 degrees

What is an isosceles triangle?

• A triangle with all sides different

• A triangle with two sides equal

• A triangle with all sides equal

• A triangle with one right angle

If two angles in an isosceles triangle are 75 degrees each, what is the third angle?

• 30 degrees

• 45 degrees

• 60 degrees

• 90 degrees