G-CO.11 Home › Forums › Questions about the standards › 7–12 Geometry › G-CO.11 This topic has 1 reply, 2 voices, and was last updated 12 years, 2 months ago by Bill McCallum. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts August 21, 2012 at 5:51 am #868 milouParticipant G-CO.11 “Prove theorems about parallelograms” Is this standard limited to parallelograms or should it include all quadrilaterals? August 21, 2012 at 11:22 am #869 Bill McCallumGuest This particular standard is just about parallelograms (which of course includes rectangles). Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In Share this:FacebookTwitterEmailPrint