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If the measure of xyz is 81 what is the measure of yz

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?

Describe the relationship between the angles of similar triangles and the sides of similar triangles