I have been trying to solve this question(please see the image)

The question asks to prove that α=β=γ=30 .

I am trying to solve this question by discovering at least three different Equations. As the number of unknown variables is 3.So,i must find at least 3 different Equations in order to find the values of the three different variables (α,β and γ).

I have successfully found the first Equation

α+β+γ=90......(i)

Please help me find out the other two Equations!

I will be thankful for help!

Note: English is my second language.

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