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1. L = s x s = 7 x 7 cm = 14 cm²

2. PS = K : 4 = 84 : 4 = 21 cm

3.

14,412

4. K = 4 x s = 4 x 25 = 100

5. Persegi 1 = K : 4 = 108 : 4 = 26

Persegi 2 = K : 4 = 144 : 4 = 36

26 – 36 = -10 cm