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170°

because: (130+105+90+45) = 370°

regular:

nAngle = Each Angle (for regular ones) = [(n-2)/n] * 180°

5Angle = [(5-2)/5]*180° = (3/5)*180 = 540/5 = 120°

not regular:

Sum(Complete) - Rest

Sum= 540°

Rest = 370°

540-370= 170°

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11y ago
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Q: What is the missing angle for a pentagon measuring 130 105 90 45?
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