Question: Lydia is designing an envelope for invitations she made. She plans to use two rectangular pieces with a width of 12cm and a length of

Lydia is designing an envelope for invitations she made. She plans to use two rectangular pieces with a width of 12cm and a length of 14cm and make the flap a triangle that goes 1/2 of the way down the envelope. If she has 20 invitations what is the area of paper she will use for the envelope.


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