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But, if not,
let BE be drawn from the point B at right angles to CD, [I.11]
therefore
the angles CBE, EBD are two right angles.
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T H E E L E M E N T S |
Book I Proposition 13 | |
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Now, if the angle CBA is equal to the angle ABD, they are two right angles. [Def.10] But, if not, let BE be drawn from the point B at right angles to CD, [I.11] therefore the angles CBE, EBD are two right angles. |
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