Use the diagram of the regular pentagon to help you construct a careful proof demonstrating that:...

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Use the diagram of the regular pentagon to help you construct a careful proof demonstrating that: 4.sin 18º. cos 36° = 1. Use

math trigonometry

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Answer 1

Answer #1

Problem can be solved as below

In A opm (pom= 36² on • om - Op Cos 36 n S T Now om= a cos 36° o ona 20m - 2acos 36° -0. in Aons nos = 18° ö ns = on sim 18°

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Answer 2

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