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a=12cm; P=48cm²
P=½a*h
48=½ * 12*h
48=6h /"6
h=8cm
Obw=a+2b (bo równoramienny)
Z Tw Pitagorasa:
½a²+h²=b²
6²+8²=b²
36+64=b²
b²=100
b=10
Obw= 12+ 2*10= 12+20= 32cm
Pozdrawiam :)
48=6h
h=8
8²+6²=x²
x²=64+36
x²=100
x=10
Ob=10+10+12=32