Question

What is the measurement of Angle O in parallelogram LMNO. When angle L is (x+40) and angle O is (3x)

Answer 1

Answer:

Angle O(3x) is =105 degrees or C

Answer 2

In a parallelogram, opposite angles are congruent.

This means that the four angles of the parallelogram are:

$L = x+40,\quad M = 3x,\quad N = x+40,\quad O = 3x$

Moreover, the sum of the interior angles of a polygon with n sides is 180(n-2). So, the sum of the interior angles of a parallelogram is 360.

This means

$L+M+N+O = 360 \iff 2(x+40)+2(3x) = 2x+80+6x = 360 \iff 8x = 280 \iff x = 35$

And since $O=3x$, we have $O=3\cdot 35=105$