4th Grade Math 10.2, Classify Triangles by Angles

We can classify (group) triangles by the size of their angles. A Right Triangle has one right angle. An Obtuse Triangle has one obtuse angle. An Acute Triangle has three acute angles. A polygon is a closed two-dimensional shape formed by three or more straight sides that are line segments. A triangle is a polygon with three sides and three angles. A vertex is a point at which two rays, or two line segments, meet in a two-dimensional shape. More than one vertex is vertices. We can name a triangle by the vertices of its angles, in any order, clockwise or counter-clockwise. We use a symbol for a triangle to write and label a triangle and it's points. An angle of a triangle can be Right, Acute, or Obtuse. A triangle cannot have more than one right angle. A triangle cannot have more than one obtuse angle. If we try to to classify triangles using a Venn diagram, the circles will not overlap because a triangle cannot be classified by type in more than one way by the size of its angles. Each triangle can only be acute, right, or obtuse. But, if we title the diagram as Angles in Triangles, and we label the circles in the Venn diagram as Angles in Triangles, they will overlap. We use higher order thinking skills to cross out a figure that does not belong. If we draw a line segment diagonally from two points in a rectangle or a square we will create two right triangles. If we draw a line segment across a square on a diagonal, then another line segment across as the other diagonal, we will form four right triangles. 4th Grade Math 10.1, Lines, Rays, and Angles https://youtu.be/EzdoXfoz0d0 4th Grade Math Playlist https://www.youtube.com/playlist?list=PLKi4WTp6PRGX7RhcxctRibNb7V091JZfn I'm using the Houghton Mifflin Go Math! 2015 copyright textbook for this playlist. You can practice online using the textbook's website https://www.gomathacademy.com/ YouTube rating for JoAnn's School videos: L0 - No strong language N0 - No nudity S0 - No sexual situations V0 - Not violent or disturbing D0 - No drug reference or content F0 - No flashing lights content FOLLOW ME: SUBSCRIBE on YouTube TWITTER https://twitter.com/JoannsSchool FACEBOOK https://www.facebook.com/JoAnnsSchool/ MINDS https://www.Minds.com/joannsschool PATREON https://www.patreon.com/JoannsSchool SUPPORT MY WORK: PATREON (one time or monthly) https://www.patreon.com/JoannsSchool PAYPAL (one time) https://www.paypal.me/JoAnnsSchool