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c² = a² + b²
suma katów w trójkącie = 180°
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a)
a = 1 , b = √3
c² = a² + b² = 1² + (√3)² = 1 + 3 = 4
c = √4 = 2
b)
a = 3 , c = 2√3
c² = a² + b²
b² = c² - a² = (2√3)² - 3² = 4 * 3 - 9 = 12 - 9 = 3
b = √3
c)
c = 20 , α = 30°
korzystamy z zależności wynikających z trójkąta prostokątnego o kątach 90°,60°,30°
c = 2a
b = a√3
a = c/2 = 20/2 = 10
b = 10√3
β = 180° - (90° + 30°) = 180° - 120° = 60°
d)
a = 3
b = a√3 = 3√3
c = 2a = 2 * 3 = 6
α = 180° - (90° + 60°) = 180° - 150° = 30°