Respuesta :

Answer:

x = 5°

Explanation:

total sum of triangles interior angle is 180°

solve:

10x - 4° + 8x + 3° + 91° = 180°

10x + 8x - 4° + 3° + 91° = 180°

18x + 90° = 180°

18x = 180° - 90°

18x = 90°

x = 5°

Answer:

sum of interior angles of a triangle is 180°

10x-4°+8x+3°+91°=180°

x=5

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