exam Maths Puzzle Numerical Ability

Find the area of a regular octagon with an apothem 13.3 feet long and each side 11 feet long

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I am a grade 10 student and we have read abt multiple and sub multiple angles..
I have problem with this questions..I hope that my question will be answered

prove that:
sin6.sin42.sin66.sin78=(1/16) which is the ordered pairs for the equation y=5x