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b = ½ 10 cm = 5 cm
c ( h) = ?
c² + b² = a²
c² + 25 cm = 169 cm | - 25 cm
c² = 144 cm | √
c = 12 cm
d = 10 cm
y = ½ × d = 5 cm
kr. boczna = 13 cm
H = ?
13² = H² +5²
169 = H² + 25
H² = 169 - 25 = 144 / √
H = √144 = 12 cm