Question

the angles of a triangle are 3x plus 12, 5x minus 6 and x plus 3 then measure of largest angle is? ​

Answer 1

We know the angle sum of a triangle is 180°.

3x + 12 + 5x - 6 + x + 3 = 180°

9x + 9 = 180°

x + 1 = 20°

x = 19°

So the largest angle is 89°, as 5x - 6 would be the greatest angle.

Answer 2

(3x+12)+(5x-6)+(x+3)=180

9x+9 =180

x= 19°

angles are: 69°, 89° and 22°

hence, largest Angle= 89°