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c = 6 cm
b = 2√7 cm
a = ?
Z tw. Pitagorasa:
a² + b² = c²
a² = c² - b² = 6² - (2√7)² = 36 - 28 = 8 cm²
a = √8 = √(4 * 2) = 2√2
a = 2√2 cm
b)
c = 6 cm
b = 2√5 cm
a = ?
a² = c² - b² = 6² - (2√5)² = 36 - 20 = 16 cm²
a = √16
a = 4 cm
c)
c = 4√5 cm
b = 2√5 cm
a = ?
a² = c² - b² = (4√5)² - (2√5)² = 80 - 20 = 60 cm²
a = √60 = √(4*15) = 2√15
a = 2√15 cm