What is the measurement of

60

Step-by-step explanation:

All the sides are equal, which makes it an equilateral triangle.

That means all the angles are equal

180/3 = 60

Angle A is 60 degrees

60 degrees

Step-by-step explanation:

This triangle has 3 sides that are all 61 units. Therefore, this triangle must be equilateral, because all of the sides are equal.

In an equilateral  triangle, all the angles are equal and add to 180 degrees.

Therefore, we can say that, if x represents an angle,

3x=180

Now, solve for x, by isolating x. 3 and x are being multiplied, so divide both sides by 3 (division is the opposite of multiplication)

3x/3=180/3

x=180/3

x=60

The measure of angle A is 60 degrees

34º

Step-by-step explanation:

yº=80º because of alternate interior angles

180-80-66=34º