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luas PQRS = p x l = 2r x r
141 = 2r^2 + 3/4 πr^2
141 = 2r^2 + 33/7 r^2
141 = 47/7 r^2
r^2 = 21
luas PQRS = 2r^2 = 2 x 21 = 42