Understanding Angles

The video tutorial introduces angles, starting with the ninety degree angle, which forms an L shape. It then explains the straight angle, which is a straight line at 180 degrees. The tutorial covers acute angles, which are less than 90 degrees, and obtuse angles, which are greater than 90 but less than 180 degrees. The importance of the ninety degree angle as a reference point is emphasized. The video also explains how to use a protractor to measure angles, highlighting the vertex as the corner of the angle.

What shape does a ninety-degree angle resemble?

• A circle

• A triangle

• A zigzag

• An L shape

Tags

CCSS.4.G.A.1

Which angle is described as being smaller than ninety degrees?

• Acute angle

• Obtuse angle

• Straight angle

• Right angle

Tags

CCSS.4.G.A.1

What is the term for an angle that is larger than ninety degrees but less than a straight angle?

• Reflex angle

• Acute angle

• Right angle

• Obtuse angle

Tags

CCSS.4.MD.C.5B

CCSS.HSG.CO.A.1

How many degrees is a straight angle?

• 90 degrees

• 180 degrees

• 360 degrees

• 270 degrees

Tags

CCSS.4.G.A.1

Which angle is used as a reference to classify other angles?

• Acute angle

• Right angle

• Obtuse angle

• Straight angle

Tags

CCSS.4.MD.C.6

What tool can be used to measure angles?

• Ruler

• Square

• Compass

• Protractor

Tags

CCSS.4.MD.C.6

Where should the dot of a protractor be placed when measuring an angle?

• On the line

• On the arc

• At the midpoint

• At the vertex

What is the vertex of an angle?

• The corner of the angle

• The longest side

• The middle point

• The outer edge