14.00
1.00
13.00
1.00
15.00
1.00
1.00
I don't see any isosceles triangle below.In general, the perimeter is the sum of the lengths of all sides. Note that in an isosceles triangle, two of the three sides have the same length.
The answer will depend on the figure - details of which you have chosen not to share.
25.92 feet
Each side is: 16.65/3 = 5.55 cm Area is: 0.5*5.55*5.55*sin(60 degrees) = 13.34 square cm rounded
4.20
16.9