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α = 180°-(30°+20°) = 130°
|ACB| = 180°-(40°+60°) = 80°
|ACB|÷2 = 40°
β = 180°-(40°+30°) = 110°
γ = 180°-(40°+20°) = 120°
9.
(3+x)² = 5²+(2+x)²
9+6x+x² = 25+4+4x+x²
2x = 20
x = 10
P = p×r
p = (13+5+12)/2 = 15
P = 15×2 = 30(j²)
p - obwód trójkąta podzielony na 2
j - jednostka (np. cm)