The value of x in the triangle is 2 ⅘ or 2.8. ( option C)
A triangle is a 3 sided polygon. The sum of angles in a triangle is 180°.
The triangle above is an isosceles triangle. An isosceles triangle is a type of triangle with two equal sides and angles.
12½(x) + 12½(x) + 25x + 40 = 180
25x + 25x + 40 = 180
50x = 180 - 40
50x = 140
divide both sides by 50
x = 140/50
x = 2.8
or 140/50 = 14/5 = 2 ⅘
Therefore x is 2 ⅘ or 2.8