In the following equilateral triangle,

each angle has a measure of 10x + 20.

X=[? ]

4°

Step-by-step explanation:

All the angles in a triangle add together to equal 180°. We know there are three angles of 20° so let's subtract this.

20° * 3 = 60°

180° - 60° = 120°

Now well divide 120° up among the three angles.

120° : 3 = 40°

Now we know the angles are 40° + 20°, but we need to find the value of x, so divide 40° by 10

40° : 10 = 4°

x = 4°