Friday, February 14, 2014

Quiz: Angle Review

In geometry, we are learning about angles!

An angle is a  figure formed when two rays share the same endpoint.

Below is a special angle called a right angle
It is also called a 90˚ angle.

Any angle less than a right is called an acute angle. 

Any angle greater than a right is called an obtuse angle. 

Below is a quiz. Can you guess the angle?

Name That Angle! on PhotoPeach
Do you see any acute, right, or obtuse angles in your house?

Tell us about them!


  1. Dear Mrs. Yollis and class,

    I think obtuse and acute are much better vocabulary than greater than a right angle and less than a right angle. Another name for a right angle is a 90 degree angle. In class, I like the way we are using the lofty vocabulary words obtuse, acute, right angle, or 90 degree to enhance our vocabulary skills.

    I see a 90 degree angle on the American flag, a piece of paper, on a face of a microwave, the publish and preview buttons on your blog and some other blogs, the screen of my TV, and a capital L.

    I would see an acute angle on a slice of cheese pizza and any kind of V. I find obtuse angles on a analog clock when it strikes 6:00, an open book's edges, and a reclined driver's seat.

    What other letters have a right angle (90 degree), obtuse angle, or an acute angle?


  2. Dear Mrs. Yollis,

    I concur with Aashi that obtuse and acute are better vocabulary than greater than and less than a right when describing angles. I see a lot of acute and obtuse angles just looking at the screen. I see a Google Chrome tab bar that on the side looks like an obtuse angle. I see another obtuse angle in the tweet screen. The second tweet in the middle has an obtuse angle. I also concur with Aashi that 90o is a better word than right angle. Looking at the computer itself I see four right angles, making it a rectangle, parallelogram and a quadrilateral. The best name is a rectangle because it is more specific that the other names that fit the category.

    To answer Aashi’s question, a capital T has two right angles. A lower case t has four. A and V both have acute angles. A K has acute and obtuse angles. What letters have no angles?




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