Question

ma puteți ajuta?multumesc

Answer 1

Răspuns:

∆ABC dreptunghicAD_l_BC

Explicație pas cu pas:

1.AB=2cm AD=2√3cm

∆ABD BD=√4-4×3

AB ipotenuză >AD sau BD 4√3>4 fals

2.AB=6cm AC=8cm

BC=√AB²+AC²=√36+64=√100=10cm

Perimetrul=10+8+6=24cm

Aria=AB×AC/2=6×8/2=24cm²

3.AC=4√3cm catetă BC=8cm ip

AB=√BC²-AC²=64-16×3=16cm

P=16+8+4√3=24+4√3

A=AC×AB/2=4√3×16/2=32√3cm²

4.DB=9cm DC=16cm

h=AD=√DB×DC=√9×16=12cm

AB=√DB²+AD²=√81+144=√225=15cm

BC=DB+DC=9+16=25cm

AC=√25²-15²=√400=20cm

P=AB+AC+BC=20+25+15=60cm

A=AB×AC/2=15×20/2=150cm²