12. In the figure ABCD is a parallelogram DE 1 AB. AB = 30cm, DE = 15cm and BC = 25 cm . Find the length of DF
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Simplify 4 square root of 2 end root plus 7 square root of 2 end root minus 3 square root of 2 . (1 point) 2 square root of 8 8 square root of 2 8 square root of 6 6 square root of 8

True or false look at the picture pls : /

*segment an is an altitude of right ? abc with a right angle at a. if ab = 2root 5 in and nc = 1 in, find bn, an, ac.