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I say that
the exterior angle ACD is equal to the two interior and opposite angles CAB, ABC,
and
the three interior angles of the triangle ABC, BCA, CAB are equal to two right angles.
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T H E E L E M E N T S |
Book I Proposition 32 | |
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Let ABC be a triangle, and let one side of it BC be produced to D; I say that the exterior angle ACD is equal to the two interior and opposite angles CAB, ABC, and the three interior angles of the triangle ABC, BCA, CAB are equal to two right angles. |
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