Which triangle is an equilateral triangle

a triangle that has all 60 degree angles

[see below]

Step-by-step explanation:

I do not see any options. However, I will provide the definition of one to help you.

An equilateral triangle is a triangle that has sides that are all equal. The three angles are also congruent, each measuring 60 degrees.

A triangle that has these factors would be an equilateral triangle.

Hope this helps.

ad = ae + ed = y + 7

similar triangles therefor

ac/ab = ad/ae

6/4 = (y + 7) / y

cross multiply

6y = 4(y + 7)

6y = 4y + 28

2y = 28

y = 14

step-by-step explanation:

answer:      

step-by-step explanation: