Question

Find the area of a circle circumscribed about an equilateral triangle whose side is 18 inches long

Answer 1

As in all geometry problems, a diagram is half the solution.

From properties of a 30-60-90 triangle,
R=9 (2/sqrt(3))
and Area=\(\pi R^2\).

Answer 2

so I multiply those numbers?

Answer 3

Show what you plan to do and we'll see.

Answer 4

2x3 then 6x9?

Answer 5

@mathmate

Answer 6

Not quite. There is only one answer in the end (area of circle).
You need to first calculate R by the proportions given. Then calculate the area of the circle using the equation for circle area.