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Thursday, October 27th 1. Write homework in your planner. - 2 sided triangle worksheet 2. Today you will need - Journal - Folder - Notebook - Hmwk(MB 3-5 Prob Week -3) Problem of the WeekDay 3 Round each number to the nearest whole number. 209.82 210 32.06 32 Round each number to the nearest tenth. 81.39 81.4 376.14 376.1 546.96 547.0 Math Message Math Journal page 75 - Use only the information given to complete the problems. Math Journal Page 75 What do these marks represent? The marks indicate sides of the same length in the given figure These marks can also be called hatch marks, slash marks, and tick marks. Note: If a side has two marks, this DOES NOT mean it is longer than a side with one mark. Math Journal Page 75 What is the definition that you wrote on page 75 for the following triangles? Has three sides that are the same length. (equal) Has least two sides that are the same length. Has no sides that are the same length. Equilateral What word to you notice in that? EQUAL - means the SAME All sides are the same length. All angles equal 60 degrees. If an equilateral triangle has three angles that equal 60 degrees, what is the sum? 60 x 3 =180 degrees If all triangles have three sides and three angles, what will be the sum of all the angles? 180 degrees - no matter what type of triangle you have! Isosceles At least two sides and two angles are the same. Can an isosceles triangle be an equilateral triangle? Yes, it only has to have two equal sides, but it can have 3. Is an equilateral triangle always an isosceles triangle? No! An isosceles triangle does not have to have 3 equal sides. Scalene Has no equal sides or angles. Can an scalene triangle be an equilateral triangle? No, an equilateral triangle has three equal sides. Can a scalene triangle be an isosceles triangle? No, an isosceles triangle has to have at least two equal sides. Pull Define these triangles by their sides. Triangle 7 cm 7 cm 3 cm isosceles After you identify an angle by its sides, you can identify it by its angles. What are these angles? acute right obtuse drag the dart to the target to check answers Right Has one right angle (90 degrees). Can a right triangle be an equilateral triangle? No, an equilateral triangle only has 60 degree angles. Can a right triangle be an isosceles triangle? Yes, it can still have two equal sides. Can a right triangle be a scalene triangle? Yes, it could have three different lengths of sides. Acute All angles are acute (less than 90 degrees). Can an acute triangle be an equilateral triangle? Yes, all of the angles are acute. Can an acute triangle be an isosceles triangle? Yes, it can still have two equal sides. Can an acute triangle be a scalene triangle? Yes, it could have three different lengths of sides. Obtuse Has one obtuse angle (greater than 90 degrees). Can a triangle have more than one obtuse angle? No, an obtuse angle is 90 degrees. If it had 2 obtuse angles it would be greater than 180 degrees. Can an obtuse triangle be an equilateral triangle? No, an equilateral triangle has all acute angles. Can an obtuse triangle be an isosceles triangle? Yes, it can still have two equal sides. Can an obtuse triangle be a scalene triangle? Yes, it could have three different lengths of sides. Pull Define these triangles by their sides and angles. Triangle cute 6m 8m 4m scalene, right Problem of the WeekQuiz Triagnle worksheet