Bell Ringer on Lesson 1-1 - 6 questions In your notes, then do p. 11-12 53, 58, 61 and 63

Bell Ringer on Lesson 1-1 - 6 questions

In your notes, then do

p. 11-12 53, 58, 61 and 63

• Watch Video - Describing What You see.

Content Standards

G.CO.1 Know precise definitions of angle, circle, perpendicular line, parallel line, and line segment, based on the undefined notions of point, line, distance along a line, and distance around a circular arc.

G.CO.12 Make formal geometric constructions with a variety of tools and methods (compass and straightedge, string, reflective devices, paper folding, dynamic geometric software, etc.).

Mathematical Practices

6 Attend to precision.

You identified and modeled points, lines, and planes.

Measure segments using equations and calculate with measures with a 90% accuracy.

• line segment

• betweenness of points

• between

• congruent segments

• construction

Length in Metric Units

B. Find the length of AB using the ruler.

Each centimeter is divided into fourths.

Point B is closer to the 4.5 cm mark.

Answer: AB is about 4.5 centimeters long.

Length in Standard Units

B.

A.

A.

B.

C.

D.

Find Measurements by Adding

Find XZ. Assume that the figure is not drawn to scale.

XZ is the measure of XZ. Point Y is between X and Z. XZ can be found by adding XY and YZ.

___

Find Measurements by Adding

Add.

Find BD. Assume that the figure is not drawn to scale.

B

C

D

16.8 mm

50.4 mm

• 3 minutes• Individual Practice p. 18 – 20 1, 2, 13, 15,

Find Measurements by Subtracting

Find LM. Assume that the figure is not drawn to scale.

Point M is between L and N.

LM + MN = LNBetweenness of points

LM + 2.6 = 4Substitution

LM + 2.6 – 2.6 = 4 – 2.6 Subtract 2.6 from each side.

LM = 1.4 Simplify.

Find TU. Assume that the figure is not drawn to scale.

TU

V3 in

A.

B.

C.

D.

in.

in.

in.

in.

Write and Solve Equations to Find Measurements

ALGEBRA Find the value of x and ST if T is between S and U, ST = 7x, SU = 45, and TU = 5x – 3.

ST + TU = SU Betweenness of points

7x + 5x – 3 = 45 Substitute known values.

7x + 5x – 3 + 3 = 45 + 3 Add 3 to each side.

12x = 48 Simplify.

Draw a figure to represent this situation.

Write and Solve Equations to Find Measurements

x = 4 Simplify.

ST = 7x Given

= 7(4) x = 4

= 28 Multiply.

Answer: x = 4, ST = 28

Now find ST.

ALGEBRA Find the value of n and WX if W is between X and Y, WX = 6n – 10, XY = 17, and WY = 3n.

Draw a diagram first.

• 5 minutes• Individual Practice

page 18 – 20 Do 21, 23, 25

Equal vs. Congruent See p. 16 in the margin

Lengths are equal and segments are congruent

• Class Assignment – in notes (8 minutes)• p. 18 - 21 9, 35, 42, 43

• HW p. 18 – 21 10 – 16 even 22- 28, 33, 46, 48