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What do we know about angles? Three types Acute Right Obtuse An acute angle’s measurement is less than 90 degrees. A right angle measures exactly 90 degrees. An obtuse angle’s measurement is greater than 90 degrees but less than 180 degrees. What type of angle is this? a) Acute b) Obtuse A right triangle has exactly one right angle. An acute triangle has three acute angles. Finally, an obtuse triangle has one obtuse angle. Finally, an equiangular triangle has all angles of 60 degrees. 600 600 600 According to angles how would you classify this triangle? a)Acute Triangle b)Right Triangle A scalene triangle has no congruent sides. Congruent means equal. An isosceles triangle has two congruent sides. An equilateral triangle has all congruent sides and angles. You can classify this triangle two ways which are they?? 1. Scalene and Obtuse 2. Isosceles and Acute 3. Equilateral and Right A triangle can be a right triangle and a scalene triangle True False Classifying Triangles by Their Angles 0 All angles will always be 60 . 600 Will always be an equilateral triangle too. 600 600 60 All 3 angles measure less than 90 degrees. 80 40 One angle measures 90 degrees and the other two angles are acute. One angle that measures more than 90 degrees and the other two are acute. 30 20 130 Classifying Triangles by Their Sides 3 congruent sides All0 angles will always equal 60 . 2 congruent sides Angles that are not formed by the equal sides are also equal No congruent sides No equal angles Now you know the basics of angles and how to classify triangles!