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70 = 2( P + L)
35 = p + L
P = 35-L
P x L = Luas
(35 -L) L = 300
35L - L² = 300
L² - 35L + 300 = 0
( L - 20) ( L - 15)
L = 15cm maka = panjang = 20cm
L² + P² = Diagonal²
15² + 20² = D²
225 + 400 = D²
D² = 625
D= √625
D=25cm