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Peter Severin · Answer 1 · 2019-10-02T22:29:23+0000

the tickmarks on the slanted sides, mean those sides are twins, namely the triangle is an isosceles triangle.

and the twin sides, coming out of the "vertex" above, make twin angles at the "base", thus 9x +3 = 84.

and surely you'd know what "x" is.

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