Angles Basics for 4th Grade

When we think about lines that go on and on forever without ever touching, what do we say these lines are?

• straight

• perpendicular

• parallel

• angles

Answer explanation

Yes! parallel lines can continue without touching. They remain the same distance apart! Did you know that the lines of latitude around the globe are parallel?

Tags

CCSS.4.G.A.1

CCSS.HSG.CO.A.1

Lines that are not parallel cross one another. We say these are __________ lines. (mathematical term)

• crisscross

• intersecting

• irregular

• improper

Answer explanation

Intersecting lines share one point where the two lines touch.

Tags

CCSS.4.G.A.1

CCSS.HSG.CO.A.1

True or False:

The point where two intersecting lines touch is called an intersection.

• True

• False

Tags

CCSS.HSG.CO.A.1

How many angles are created when two lines intersect?

• one

• two

• three

• four

• five

Answer explanation

2 intersecting lines form 4 angles.

Tags

CCSS.4.MD.C.5B

CCSS.HSG.CO.A.1

When we label intersecting lines as angles, the letter P goes in the middle. Which of the following angles is labeled correctly?

• Angle PDA

• Angle DPB

• Angle PAC

• Angle DAP

Answer explanation

When we label angles, the intersection point is written in the center of the label. In this drawing, we could label angles APD, DPB, BPC, and APC.

Tags

CCSS.4.G.A.1

CCSS.4.MD.C.5

True or False:

This is called an arc.

• True

• False

Answer explanation

Yes! An arc is the measure of an angle!

Tags

CCSS.HSG.CO.A.1

True or False:

An arc is a portion of a circle.

• True

• False

Answer explanation

If you were to lay two line segments on top of one another, and then rotate one of the segments, the distance between the two lines forms an arc.

Tags

CCSS.HSF.TF.A.1

CCSS.HSG.C.B.5

CCSS.HSG.CO.A.1

When we think about line segments rotating, we can picture the intersection point of the minute hand and the hour hand. As the hands rotate, they form angles. Can you see the comparison?

• Yes

• No

• I sort of see it.

Tags

CCSS.4.MD.C.6

What do we call lines when the angles formed by intersecting lines are exactly the same?

• parallel

• acute

• obtuse

• perpendicular

Tags

CCSS.4.G.A.1

CCSS.HSG.CO.A.1

True or False:

When perpendicular lines intersect, they form right angles.

• True

• False

Tags

CCSS.4.G.A.1

CCSS.HSG.CO.A.1