Perimeter = 73.6 in
Step-by-step explanation:
Using the Pythagoras Theorem,
RU^2 = 15^2 + 5^2
RU^2 = 225 + 25
RU^2 = 250
RU = sqrt(250)
RU = 15.81 in
ST = RU = 15.81 in
UT = 5 + 16 = 21 in
RS = UT = 21 in
Perimeter = RU + ST + UT + RS = 15.8 + 15.8 + 21 + 21 = 73.6 in