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a)
przekątna kwadratu = a√2
a - bok kwadratu
√521 = a√2
a = √521/√2 = √260,5 = ok 16,14
b)
√3,92 = a√2
a = √3,92/√2 = √1,96 = 1,4
c)
√1,25 = a√2
a = √1,25/√2 = √0,625 = ok 0,79
zad 2
b - ramię = 15 cm
a - podstawa = ?
h = 2/3a
b² = (1/2a)² + (2/3a)² = a²/4 = 4a²/9
15² = (9a² + 16a²)/36
225 razy 36 = 25a²
8100 = 25a²
a² = 8100/25 = 324
a = √324 = 18 cm
obwód = a + 2b = 18 + 30 = 48 cm