Răspuns :
AB²=BD²-AD²
AD=BC=7 cm
AB²=25²-7²
=625-49
=576 cm²
AB=√576=24 cm
A(aria)=L×l=AB×BC=24×7=168 cm²
AD=BC=7 cm
AB²=25²-7²
=625-49
=576 cm²
AB=√576=24 cm
A(aria)=L×l=AB×BC=24×7=168 cm²