Răspuns :
AB/AC=3/4
AB=3k
AC=4k
BC=√[(3k)²+(4k)²]=√(9k²+16k²)=√25k²=5k
A=AB×AC/2=3k×4k/2=6k²
A=AD×BC/2=36×5k/2=90k
90k=6k² :k
90=6k
k=90/15
AB=3k=3×15=45
AC=4k=4×15=60
BC=5k=5×15=75
P=45+60+75=180 cm
A=45×60/2=1350 cm²
AB=3k
AC=4k
BC=√[(3k)²+(4k)²]=√(9k²+16k²)=√25k²=5k
A=AB×AC/2=3k×4k/2=6k²
A=AD×BC/2=36×5k/2=90k
90k=6k² :k
90=6k
k=90/15
AB=3k=3×15=45
AC=4k=4×15=60
BC=5k=5×15=75
P=45+60+75=180 cm
A=45×60/2=1350 cm²