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
16.9
It graphs out as a right angle triangle with a perimeter of 35 inches rounded to the nearest inch with a 90 degree angle and two acute angles of 26.6 degrees and 63.4 degrees both rounded to 3 significant figures.