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FG touches the circle ABCD,
and
EA has been joined from the center E to the point of contact A,
therefore
the angles at A are right. [III.18]
For the same reason
the angles at the points B, C, D are also right.
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T H E E L E M E N T S |
Book IV Proposition 7 | |
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Then, since FG touches the circle ABCD, and EA has been joined from the center E to the point of contact A, therefore the angles at A are right. [III.18] For the same reason the angles at the points B, C, D are also right. |
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