Math, asked by devanssssh, 1 year ago

which formula and of which chapter is this question ?

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Answered by BadaSaGadha

It is a mix of Trignonometery and Quadrilaterals.

There are many formulaes that can be used.

Please search on Google the following : All trigonometric identites and Also, you should know the properties of a trapezium to solve it.

devanssssh: Thanks for the help man

BadaSaGadha: Welcome :)

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