Question

Consider the figure:

If BC = AC, x = 2y, and $\angle ACB$ = 60^o, then find the value of $\angle$A + $\angle$B + $x$ + $y$ (in degrees).

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Answer 1

$\angle$C = 60^o and BC = AC,
By angle sum property of triangle, $\angle$A = $\angle$B = 60^o

$\angle$A +$\angle$B +$x$ +$y$ = ${60}^{\circ }$ ​+${60}^{\circ }$ ​+${120}^{\circ }$​ = ${240}^{\circ }$​

[Since, $x$ +$y$ = $\angle$A +$\angle$B]