Question
Find $x + y + z$
✓
Answer
By angle sum property of a triangle.
$180^\circ - x + 180^\circ - z + 180^\circ - y = 180^\circ $
$-x -y -z =180^\circ -180^\circ - 180^\circ - 180^\circ $
$-x -y -z = - 360^\circ $
Multiplying $-1$ to both sides we get,
$\therefore $ $x + y + z = 360^\circ $
$180^\circ - x + 180^\circ - z + 180^\circ - y = 180^\circ $
$-x -y -z =180^\circ -180^\circ - 180^\circ - 180^\circ $
$-x -y -z = - 360^\circ $
Multiplying $-1$ to both sides we get,
$\therefore $ $x + y + z = 360^\circ $
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