What is a 90 degree angle called? A 90 degree angle is called a right angle of course. For 3 to 2 weeks we have been measuring angles 

L.I. I can demonstrate an understanding of angles, area and volume of specific polygons

What I learned: I learned that half of a square is a triangle which means that a triangle can only be 180 degreea or else it will not be a proper triangle.

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