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PQ =√[(12)^(2) + (9)^(2)]
PQ = √144 + 81
PQ = √225
PQ = 15

PS = √[(12)^(2) - (9)^(2)]
PS = √144 - 81
PS = √63
PS = 3√7

L = (PQ + SR) ÷ 2 × PS
L = (15 + 9) ÷ 2 × 3√7
L = 24 ÷ 2 × 3√7
L = 36√7