Given: [i]ABCD[/i] is a parallelogram with [i]AB [/i]parallel to [i]CD [/i]and [i]AC [/i]parallel to [i]BC[/i]. Diagonal [i]AC[/i][br]is congruent to diagonal [i]BD[/i].
Prove: [i]ABCD[/i] is a rectangle (angles [i]A, B, C,[/i] and [i]D[/i] are right angles.)
IM G Unit 2 Lesson 13 from IM Geometry by Illustrative Mathematics, [url=https://im.kendallhunt.com/HS/students/2/2/1/index.html]https://im.kendallhunt.com/HS/students/2/2/13/index.html[/url]. Licensed under the Creative Commons Attribution 4.0 license, [url=https://creativecommons.org/licenses/by/4.0/]https://creativecommons.org/licenses/by/4.0/[/url].