4-5 Isosceles and Equilateral Triangles

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Presentation transcript:

4-5 Isosceles and Equilateral Triangles Drawing on the definition of the congruence of triangles, students will construct algebraic equations.

4-5 QUIZ The following questions are designed to help you decide if you understood today’s lesson. Please record the number you got right on your portfolio sheet. Make time to come and see me if you miss more than 2 and you do not understand why!

1. Supply the reasons missing from the proof shown below. ASA; Corresponding parts of ≌ Δs are ≌ SAS; Reflexive Property SSS; Reflexive Property SAS; Corresponding parts of ≌ Δs are ≌ Non-Response Grid

2. Find the values of x and y. x = 90; y = 47 x = 90; y = 43 x = 47; y = 43 x = 43; y = 47 Non-Response Grid

3. In an A-frame house, the two congruent sides extend from the ground to form a 34° angle at the peak. What angle does each side form with the ground? 156 146 73 78 Non-Response Grid

4. What is the measure of a base angle of an isosceles triangle if the vertex angle measures 38° and the two congruent sides each measure 21 units? 71° 142° 152° 76° Non-Response Grid

neither 10 – x nor 6x + 5 10 – x only both 10 – x and 6x + 5 5. Two sides of an equilateral triangle have lengths 2x – 2 and 3x – 6. Which of 10 – x or 6x + 5 could be the length of the third side? neither 10 – x nor 6x + 5 10 – x only both 10 – x and 6x + 5 6x + 5 only Non-Response Grid

Then rate your assignment 4-5 p. 254-256 #6-28 even Then rate your assignment 4-3-2-1-0 as to how well you understood the lesson and write why you rated yourself that way.