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1 + 2 + 3 = 6
α = 180/6 = 30⁰
β = 180/3 = 60⁰
γ = 180/2 = 90⁰
Z własności trójkąta prostokątnego o kątach ostrych 30⁰ i 60⁰ mamy:
c = 2a = 12 cm
a = 6 cm
b = h = a√3 cm = 6√3 cm
P = ¹/₂ * a * h = ¹/₂ * 6cm * 6√3cm
P = 18√3 cm²