ABCD is a rectangle with AD=12cm and DC=20 cm the line segment de drawn making an angle of 30° with AD intersecting AB in E find the lenghts of DE and AE
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cos30°=1/2
In ΔDAE
cos theta= perpendicular/hypotenuse
cos30 = AD/DE
√3/2 =12/DE
DE=8√3
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