All About Angles!

By: Lori Tennis

What Are Angles?

The space between two intersecting lines

Measured in degrees

Where Do We See Angles?

EVERYWHERE

Types of Angles

• ACUTE

• RIGHT

• OBTUSE

• STRAIGHT

• REFLEX

ACUTE ANGLES

Angle is less than 90o

RIGHT ANGLES

Angle is exactly 90o

Marked with a square

OBTUSE ANGLES

Angle is greater than 90o

&Angle is less than 1800

STRAIGHT ANGLES

Angle is exactly 180o

Straight line = Straight Angle

REFLEX ANGLES

Angle is greater than 180o

&Angle is less than 3600

Making Connections…USE A CIRCLE

One whole turn is 3600

900

1800

2700

00 or 3600

Add 900

Add 900

Add 900

Add 900

Angles to Fractions

¼ of 3600 is 90o

½ of 3600 is 180o

¾ of 3600 is 2700

00 or 3600

Making Connections…Fractions to Angles

• ¼ + ¼ = 2/4 = ½

• 900 + 900 = 1800

• Right Angle + Right Angle = Straight Angle

What Type of Angle Am I?

A B

C

What Degree Am I?A

B

C

D

What Fraction Am I?A

B

C

D

Works Cited

• Angle Definition found by Google Dictionary (Slide 1)

• Angle Information found at mathisfun.com/angles.html (Slides 4-8)

Photo Credit• Slide 1:

– Angles found at http://www.mathsisfun.com/angles.html

• Slide 3: – Fence found at

http://dutchangles.files.wordpress.com/2012/02/pic_0626.jpg – Stop sign found at http://jazzadvice.com/overcoming-creative-blocks-as-an-improviser/stopsign/

– Student desk found at http://smith.stage.risdall.com/productCategory.asp?categoryID=375

– Folders found athttp://catholicblogger1.blogspot.com/2012/08/student-foldersbinders.html

• Slide 5: – Acute angles found at

http://ellerbruch.nmu.edu/classes/cs255f04/cs255students/mcox/P8/P8.html

Photo Credit

• Slide 7: Obtuse Angles found at http://www.mathatube.com/glo-obtuse-angle.html

• Slide 8: Straight Angles found at http://3walshmath01056.wikispaces.com/Angles+Nick

• Slide 9: Reflex Angles found at http://schools.look4.net.nz/maths/angles/reflex_angles