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Lesson 13-2: Isosceles Triangles TSW: DEVELOP THEOREMS ABOUT ISOSCELES TRIANGLES. TSW: PROVE THEOREMS ABOUT ISOSCELES TRIANGLES. Lesson 13-2: Isosceles Triangles Warm-Up Find the measurement of A. Find the value of x. 57° x + 17 x 63° mA = 20° x = 120° Page 186 Isosceles Triangle – A triangle with at least 2 congruent sides and 2 congruent angles. Page 187 50° 130° Page 187 x = 25 Page 188 And the perimeter of the triangle. Perimeter = 145 Page 188 18. AC = 18 19. 30° 20 a. x = 6 b. mA = 20° mB = 30° mC = 130° c. scalene, obtuse 21. Disagree. Since the sum of the angle measures in a triangle is 180°, the only possible value of y is 32°. Since no two angles of the triangle are congruent, the triangle cannot be isosceles.