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4.1 – 4.4 In-Class Review 1) Classify the triangle by its sides and angles. 5 3 4 2) Classify the triangle by its sides and angles. 30 75 3) If XYZ is an isosceles triangle, ∡𝑌 is the vertex angle, XY = 5x + 3, YZ = 7x – 5, and XZ = 3x – 8, find the value of x and the length of XZ. 4) Find the missing angle measures using the figure below. a) m∠1 b) m∠2 c) m∠3 d) m∠4 e) m∠5 5) Given the triangles below, write out a true congruence statement about the triangles. 6) Suppose △ABC ≅ △DEF. a) Find the value of y. b) Find the value of x. 7) If KMD SCD, which side corresponds to ̅̅̅̅ 𝑆𝐷 ? 8) In the figures below, determine which theorem/postulate can be used to show that the triangles are congruent to each. (Note: it may not be possible). a) b) N A C 9) Fill in the blanks to complete the following proof: Given: O is the midpoint of ̅̅̅̅ 𝐴𝐷 O is the midpoint of ̅̅̅̅ 𝐵𝐶 Prove: AOB DOC Statement 1) O is the midpoint of ̅̅̅̅ 𝑨𝑫 2) ̅̅̅̅ 𝑨𝑶 ≅ ̅̅̅̅̅ 𝑫𝑶 3) O is the midpoint of ̅̅̅̅ 𝑩𝑪 4) 5) ∡𝑨𝑶𝑩 ≅ ∡𝑫𝑶𝑪 6) Reason 1) Given 2) 3) 4) Midpoint Theorem 5) 6)