Two-thirds times Ten...

2/3 x 10 = 20/3 in fraction form. 2/3 x 10 = 6.6667 in decimal form.

Step-by-step explanation:

Perimeter = 3x. Area = x^2 * sqrt(3)/4. Explanation of area:. You can divide an equilateral triangle into 2 right triangles, each with a common side we will call y.. Area = area of first right triangle + area of second right triangle = (x/2)*y/2 + (x/2)*y/2 = xy/2. Now: y^2 + (x/2)^2 = x^2 so y…