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c=15cm
2a=c
2a=15
a=15/2 cm =7,5cm--->krotsza przyprostokatna
a√3=15√3/2=7,5√3 cm------>dluzsza przyprostokatna
PΔ=1/2·a·a√3=1/2·7,5·7,5√3=28,125√3 cm²
O=a+a√3+c=7,5+7,5√3+15=22,5+7,5√3 cm