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3+11=14
56*2=112
112/14=8
odp wysokość wynosi 8cm
a tego 1 nie wiem
P = ½(3+7)*2
P = 10 cm ²
2. P = 56 cm²
56 = ½(3+11)*h
56 = ½*14*h
56 = 7*h
h = 8
a = (7 - 3) / 2 = 2
a = h (kat jest rowny 45 °)
a² + h² = b²
2² + 2² = b²
4 + 4 = b²
b² = 8
b = √8
b = 2√2
Ob = 3 + 2 * 2√2 + 7
Ob = 10 + 4√2
Zad 2
h = (3P) / (a + b)
h = 3 * 56 / (3 + 11)
h = 168 / 14
h = 12