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x= 180° - 50°= 130°
ΔABD jest równoramienny
50°:2= 25°
δ= 25°
2) tw. pitagorasa
4² + 3²= x²
x²= 16 + 9
x²= 25
x= 5
Ob= 4+3+5= 12cm
3) Ob= 21
21: 3= 7
4) 180° - (90°+30°)= 60°
a= 12
a√3= 12√3
2a= 24
a√2= 12√2
Ob= 12+12√3+24+12√2= 36+12√3+12√2