math
posted by marlon on .
if the measure of the two opposite angles of a parallogram are: 3x + 40 and x + 50, what is the value of x and the measure of its angle

Sum of angles is:
2*(3x+40+x+50)=2*(4x+90)=8x+180
If you measuring angles in °
8x+180°=360°
8x=360°°180°=180°
8x=180° Divide with 8
x=180°/8
x=22.5°
First angle=3x+40=3*22.5+40=67.5+40=
107.5°=107°30´
Second angle=x+50=22.5+50=72.5°=72°30´ 
In a certain triangle, one angle has a measure of 53° and another angle has a measure of 74°. If the triangle is isosceles, then which of the following could be the measure of the third angle?