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zmey [24]
3 years ago
13

Write and solve an equation to determine the measures of the angles in each

Mathematics
1 answer:
Anarel [89]3 years ago
5 0

Answer:

9. x = 45°

10. x = 55°

11. x = 9°

Step-by-step explanation:

9. \: x + x + 2x = 180 \\ 4x = 180 \\ x =  \frac{180}{4}  \\ x = 45

10. \: x + (x - 2) + 72 = 180 \\ x + x - 2 + 72 = 180 \\ 2x + 70 = 180 \\ 2x = 180 - 70 \\ 2x = 110 \\ x =  \frac{110}{2}  \\ x = 55 \\

11. \: 4x + 3x + 13x = 180 \\ 20x = 180 \\ x =  \frac{180}{20}  \\ x = 9 \\

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