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
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