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P = 6*3 = 18 cm²
Ob = 2 * 6 + 2 * 3 = 12 + 6 = 18 cm
2) a = 2 m, b = 14 m
Ob = 2 * 2 + 2 * 14 = 4 + 28 = 32 m
P = 2 * 14 = 28 m²
3) a = 9 dm, Ob = 28 dm
28 = 2b + 2*9
28 = 2b + 18
28 - 18 = 2b
10 = 2b /:2
5 = b
P = 9 * 5 = 45 dm²
4) b = 4mm, P = 32 mm²
P = ab
32 = 4a /:4
8 = a
Ob = 2*8 + 2*4 = 16 + 8 = 24 mm
5) a = 5 m = 50 dm, Ob = 114 dm
114 dm = 2b + 100dm
114 - 100 = 2b
14 = 2b /:2
7 = b
P = 7*50 = 350 dm²