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b = 10+4√3 cm
h = 4 cm
Żeby wyliczyć b i h musi być rysunek no ale tu nie mam jak go narysować ...
P = (a+b)h /:2
P = (10+10+4√3) * 4 /:2
4 i 2 skracasz
P= (20 +4√3) * 2
P = 40 + 8√3 (cm2)
sinα=h/c
h/4=1/2
h=2
cosα=x/c
cosα=√3/2
x/4=√3/2
x=2√3
b=a+2x
b=10+4√3
P=1/2*(a+b)*h
P=1/2*(10+10+4√3)*2
P=20+4√3