Triangles have a total of 180°. Use the triangle below to determine the value of X.

3x=105

x=35

Step-by-step explanation:

40+3x+x = 180 (Angle sum property)

40 +4x=180

4x = 180-40

          140

x = 140/4

       =35

 3x = 35 x 3

          105

x = 35

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the 2 figures are congruent bc if you reflect abcd over the y axis then over the d axis the figures overlap

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