You are here: Home > Student Activities > Alphabet Geometry > Obtuse Angles Obtuse Angles More Alphabet Geometry Angles Parallel Lines Symmetry Transformations Obtuse Angles Introduction Definition Review Quick Quiz Students should be able to: identify and describe the relative size of acute and obtuse angles with respect to right angles.     Introduction to Obtuse Angles: The Letter K Look closely at the angles in the letter K- can you identify each of them (there are three)? One of the angles opens wider than the other two. Can you identify it? Push the button to reveal it.   What can you learn by looking at the letter K?   Let's start with reviewing three kinds of angles:   1 - acute angle; 2 - right angle; 3 - obtuse angle   When the letter K is turned on its side, we see an angle >90º (greater than 90º). Therefore, when we look at the letter K we see an OBTUSE ANGLE. Use this mini-movie on your SmartBoard	Subscribe to the misterteacher newsletter Stay up to date on all of our new, free, mini-movies and student activities as they are added to the site each month. Enter your Email Preview | Powered by FeedBlitz   more from misterteacher.com
Review: What is an obtuse angle? Where are the obtuse angles? How many can you find?   An obtuse angle has a measure greater than 90º. Stealth Bomber from DefenseLink
Are there other letters with obtuse angles?   How many obtuse angles does the letter X have? Make an educated guess and then push the button on the right to find out. Use this mini-movie on your SmartBoard Can you spot the obtuse angles in the letter Y? Guess how many there are and then click the button on the right to find out if you were correct. Use this mini-movie on your SmartBoard   Quick Quiz An obtuse angle can have a measure of 85º. True False   Angle A Angle B   Which angle above is an obtuse angle? Angle A Angle B     More Angles More Angles: Acute Angles | Obtuse Angles | Right Angles | Vertical Angles     More Home Angles Parallel Lines Transformations Tessellations Similar Figures Symmetry
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