Assuming that this is an Isosceles Triangle which has 2 sides equal, then we can assume as well that XZ being the base of 15 and the total perimeter is XWZ = 50.
Perimeter = X + W + Z
Therefore;
XWZ (50) – XZ (15) = 35
Since we are assuming that this is an Isosceles triangle then 2 sides should have equal distance.
35 / 2 = 17.5
Hence, XW = 17.5 and ZW = 17.5
Perimeter = 15 + 17.5 + 17.5 = 50