two isosceles triangles with common line
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If you mean vertices of (-1, 4) (2, 7) and (1, 5) then it is an isosceles triangle with a perimeter of square root of 18 plus square root of 5 plus square root of 5 which is about 8.715 rounded to three decimal places.
There are many perimeter formulas, because there's a different one for each shape. P= Perimeter For a rectangle, if L= Length and W=Width, then P= 2L plus 2W .
An isosceles trapezoid is a 4 sided quadrilateral that has 1 pair of opposite parallel sides of different lengths and has 2 equal diagonals plus equal base angles.
The perimeter is the length plus width times 2.
Its perimeter is half of its circumference plus its diameter