Find the value of a and b in parallelogram QRST.

because both sides have to be equal:

b+11 = 2b

11=2b-b

11=b

3a+7=4a

7-3a=4a-3a

a=7

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk

wait nvm i know the correct answer now its 100%   81 square feet

~batmans wife dun dun