LESSON 1 Lines, Rays, and Angles

Vocabulary to know!

an exact location in space point an exact location in space DRAW IT READ IT WRITE IT point A point A A

line a straight path of points that continues without end in BOTH directions DRAW IT READ IT WRITE IT line BC line CB BC CB b c

ray part of a line that has one endpoint and continues on without end in ONE direction DRAW IT READ IT WRITE IT ray FG FG F G

part of a line between two end points line segment part of a line between two end points DRAW IT READ IT WRITE IT line segment DE line segment ED DE ED d e

angle Formed by two rays or line segments that have the same endpoint. The shared endpoint is called a vertex. DRAW IT READ IT WRITE IT F G H angle FGH angle HGF angle G ∠ FGH ∠ HGF ∠ G

Types of Angles!

right angle forms a square corner

straight angle forms a line

is less than a right angle acute angle is less than a right angle

is greater than a right angle and less than a straight angle obtuse angle is greater than a right angle and less than a straight angle

Guided Questions

Name a Line A E d c B

Name a Ray A E d c B

Name an Acute Angle A E d c B

Draw and label a line segment named XY

Draw and label an obtuse angle named ∠ JKL

Draw and label a straight angle named ∠ WXY

Pattern Block Angles

all of the angles in a hexagon are obtuse. Trace a hexagon and label all the points like below. What kind of angles do you see? A B all of the angles in a hexagon are obtuse. F C E D

all of the angles in a square are right. Trace a square and label all the points like below. What kind of angles do you see? G H all of the angles in a square are right. j i

ACUTE ∠KNM, ∠ NML OBTUSE ∠ NKL, ∠ KLM Trace a trapezoid and label all the points like below. Name 2 acute and 2 obtuse angles. K L ACUTE ∠KNM, ∠ NML OBTUSE ∠ NKL, ∠ KLM N M

all of the angles in an equilateral triangle are acute. Trace a triangle and label all the points like below. What kind of angles do you see? P all of the angles in an equilateral triangle are acute. O Q