Finding the missing angle measure using algebra

Angles with algebra day one.notebook

December 07, 2015

Finding the missing angle measure

using algebra

WARM UP: Find all missing angles!

ab d e 29 c g f

Last week our angles looked like this!

320 x0

What should we do now????

2x + 20

4x

Angles with algebra day one.notebook

Solve for the missing angle measures Equation

Solve for x

(5x

+

o 7)

48o

December 07, 2015

Find (5x + 7)

To Solve for missing angle measures using algebra

Step 1: Figure out if the angles given are congrsuaemne t, supplementary (180) or complementary(90) Step 2: Set up an equation that relates the angles

If congruent set the measures equal

If supplementary

add the measures set them equal to

180

Step 3: Then solve for x Step 4: Find missing angle measures

Angles with algebra day one.notebook

Find the missing angle measures Equation Solve for x

2x - 10

December 07, 2015

65 - x

Angle measures

2x - 10

65 - x

Solve for angle 1 and angle 2 Equation

1

(x + 40)o

2 (2x + 20)o

Angles with algebra day one.notebook Name___________________________ Date____________ Math 8 Angles: Using Algebra 1. Patty is making a quilt following the pattern shown below.

Show your work.

(2x + 50) (3x)

December 07, 2015

If all the horizontal lines are parallel, what is the value of x?

Answer____________________

___ 2. In the figure below, DC intersects BA at point B.

D

A

5x + 20

3x B

What is the measure, in degrees, of ABC? C

Show your work.

Answer_________ degrees

Angles with algebra day one.notebook

December 07, 2015

3. The figure below shows parallel lines cut by a transversal.

y

z

x

w

a

d 75

b

Part A Based on the information in the figure, complete the table below with the

measures of each angle

Angle

a

b

d

w

x

y

z

Degree Measure

Part B Name one pair of supplementary angles.

Answer____________________

4. In the figure below, lines m and n are parallel. Line l is a transversal.

(8x) m

B

(3x + 40)

Part A What is the value of x? Show your work.

n A

l

Answer_________________

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