Find the length of the two sides of base. Add the two numbers. Then multiply by 2.
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To find the perimeter of a figure, add up the lengths of all of its sides.
You need to tell us what shape your figure is...
It is a circle, so use the formula "pie r squared" to figure it out
The area of ANY triangle is base x height. The height must be measured perpendicular to the base. In the case of an isosceles triangle, if you know only the length of the sides, you can figure out the height by Pythagoras' Theorem.
It isn't clear how you would define the "perimeter" for a 3D figure. The base is the product of length x width.