Bring note cards to classBring workbook to class Bring colored pencils to class

1-28-13 Angle and Triangle Vocabulary Essential Questions: Where is geometry seen in the real world? What professions use geometry?

BOP: What geometry term might you associate with each object?1. one edge of a cardboard box line segment or line 2. the floor plane or rectangle3. the tip of a pen pointDWP: What is the measure of the smaller angle between the hour hand and the minute hand on a clock at eight o’clock?

120 degrees

Check your memory! Sketch an example for each

point angle triangleline right angle equilateral

triangleray acute angle isosceles

triangleline segment obtuse angle right triangle

plane straight angle acute trianglepoint complementary angles obtuse triangleline supplementary angles scalene triangleray congruent anglescongruent adjacent angles

vertex vertical anglesside parallel perpendicular

Flip Chart Directions•Have 25 3 by 5 or 4 by 6 note cards and a folder. A sturdy piece of paper is needed if folders are not available to hold the note cards that will be taped to it.•All note cards should be taped lined side up, with the red line at the bottom. Start by lining up the first note card with the bottom of the folder. Tape the note card in place.•Line the next note card up with the red line of the first note card. Tape it in place. Continue doing this until all 25 note cards taped down. •On the top note card, make it a “Title Note Card”. •On the next note card, write the word RAY in the part of the note card that is showing. Lift the top note card; write the definition of the word RAY. On the back of the note card, draw an example. •Continue through the note cards until all of the vocabulary is done. You should have 4 blank note cards. More vocabulary will be added throughout the unit.

We will make vocabulary cards for this unit. Cards should have the word and picture on the front. Definition on the back.

Bring cards to class tomorrow. You will need 30 cards in all.

ANGLE

A figure formed by two rays with a common

endpoint.

Vocabulary Term

Definition Example or Picture

point Exact location in space

line a straight path that extends without end in opposite directions.

ray A part of a line. It has exactly one endpoint

line segment

part of a line. or a raythat extends from oneendpoint to another.

plane perfectly flat surface that extends infinitely in all directions.

congruent Same size, same shape

vertex Corner or intersection of geometric points

side One of the rays forming the exterior of an angle or polygon

parallel Lines in the same plane that do no intersect

perpendicular Lines that intersect to form right angles

RAY

A ray is a part of a line. It has exactly one endpoint.

Name its endpoint first.

ANGLE

A figure formed by two rays with a common endpoint.

VERTEX

A vertex is the point where two sides intersect.

SIDEThe side of an angle is one of the

rays forming the exterior of the angle

or a polygon.

Course 2

7-1 Points, Lines, and Planes

A ray is a part of a line.It has one endpoint andextends without end inone direction.

GHName the endpointfirst when naminga ray.

A line segment is part of a line. or a raythat extends from oneendpoint to another.

LM, or MLUse the endpointsto name a line segment.

L M

HG

Course 2

7-1 Points, Lines, and PlanesA point is an exact location in space. It is usually represented as a dot, but it has no size at all

• A point AUse a capital letter to namea point.

A line is a straight path that extends without end in opposite directions.

A number line is an example of a line.Helpful Hint

XY, or YXUse two pointson the line to name a line.

X Y

Course 2

7-1 Points, Lines, and Planes

A plane is a perfectly flatsurface that extends infinitelyin all directions.

plane QRSUse three pointsin any order, noton the same line,to name a plane.

A coordinate plane is an example of a plane.Helpful Hint

Q

R

S

Course 2

7-1 Points, Lines, and PlanesFigures are congruent if they have the same shape andsize. If you place one on top of the other, they matchexactly. Line segments are congruent if they have thesame length.

Tick marks are used to indicate congruent line segments. In the illustration below, segments that have the same number of tick marks are congruent.Line segments AB and BC are congruent (one tick mark), and line segments MN and OP are congruent(two tick marks).

M P

ON 5 ft

3 ft3 ft

8 ftA C

B

20 m20 m

16 m

SUMMARY:

Where is geometry seen in the real world? What professions use geometry?

Homework: Make index cards with words from column 1; Work on ratio and proportionDrawing due on Friday.