T H E E L E M E N T S	Book III   Proposition 28
	But equal angles stand on equal circumferences, when they are at the centers; [III.26] therefore     the circumference AGB is equal to DHE. And the whole circle ABC is also equal to the whole circle DEF; therefore     the circumference ACB which remains is also equal to the circumference DFE which remains. Being what it was required to prove.
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