Zadanie
a = 15 cm
c = 17 cm
b = ?
a² + b² = c²
15² + b² = 17²
225 + b² = 289 l -225
b² =64
b = √64
b = 8 cm
P = a · b
P = 15 · 8 = 120 cm²
Ob. = 2·a + 2·b = 2·(a + b)
Ob. = 2·(15 + 8) = 2 · 23 = 46 cm