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That the diagoniall Lines of a Rhombeids be equall.
Let ACBD be a Rhomboides, and AB stretch'd out in infinitum, after the infinite productions of CB and AD. I say, that DC will be equall to AB. For EC is equall to EA, and ED to EB, by the precedent Theorem. Wherefore DC and AB are equall.
The same is also as briefly prov'd by the first or second Appendix of the precedent Theorem.
STANZ. 58. And with her grasping rayes, &c.