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10 cards from this deck
Angle = (number/total) × 360°
The total angle in a pie chart is 360°.
Angle = (30/72) × 360° = 150°
Total = 90 + 42 + 30 + 18 = 180 flats.
90/360 simplifies to 1/4 or 25% of the circle.
A protractor for angles and a ruler for the circle.
To ensure calculations are correct.
Forgetting to find the total first.
Add all angles; they should equal 360°.
Recheck your calculations for errors.
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