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240 = p x 3/5p
240 = 3p^2/5
3p^2 = 240×5
3p^2 = 1200
p^2 = 1200/3=400
p = 20 Cm
l = 3/5p = 3/5 × 20
= 12cm
34. 180 = 5/4l x l
180 = 5/4l^2
l^2 = 180×4/5 = 144
l = 12 cm
p. = 5/4×12 = 15
k. = 2(p+l)
= 2 (15+12) = 54 cm