I think the answer is 1/8
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Hope this helps but I think the answer is 12.
Answer:

Step-by-step explanation:
Diameter of the circle=

Circumference of a circle:


Area of the circle:


In geometry, an equilateral triangle is a triangle in which all three sides have the same length. In the familiar Euclidean geometry, an equilateral triangle is also equiangular; that is, all three internal angles are also congruent to each other and are each 60°