2:
You're finding perimeters so you're basically adding up all the sides.
44 + 36 + 11 +9 = 100
P(triangle BDE) = 100
4:
triangle XYZ is double the size of triangle RST
the constant of proportionality is 2
This means that ZX will be 12 , ZY will be 26 , and XY will be 17.4
Add them together, and you get 55.4
P(triangle XYZ) = 55.4
