T H E E L E M E N T S |
Book I Proposition 48 | |
And, since
DA is equal to AB, and
AC is common, the two sides DA, AC are equal to the two sides BA, AC; and the base DC is equal to the base BC; therefore the angle DAC is equal to the angle BAC. [I.8] But the angle DAC is right; therefore the angle BAC is also right. |
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