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Then, since in any triangle the three angles are equal to two right angles, [I.32]
the three angles CAB, ABC, BCA of the triangle ABC are equal to two right angles.
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T H E E L E M E N T S |
Book III Proposition 22 | |
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Let AC, BD be joined. Then, since in any triangle the three angles are equal to two right angles, [I.32] the three angles CAB, ABC, BCA of the triangle ABC are equal to two right angles. |
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