T H E E L E M E N T S |
Book IV Proposition 13 | |
Then, since BC is equal to CD, and CF is common, the two sides BC, CF are equal to the two sides DC, CF; and the angle BCF is equal to the angle DCF; therefore the base BF is equal to the base DF, and the triangle BCF is equal to the triangle DCF, and the remaining angles will be equal to the remaining angles, namely those which the equal sides subtend. [I.4] |
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