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I say that angle BEC is double of the angle BAC.
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T H E E L E M E N T S |
Book III Proposition 20 | |
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Let ABC be a circle, let the angle BEC be an angle at its center, and
the angle BAC an angle at the circumference, and let them have the same circumference BC
as base; I say that angle BEC is double of the angle BAC. |
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