Kak mohon bantuannya ya, pakai cara

Kak mohon bantuannya ya, pakai cara

Panjang = 15 cm

lebar = 8 cm

Luas = panjang x lebar

Luas = 15 cm x 8 cm = 120 $cm^2$

b) Phytagoras

${BD}^2={AD}^2+{AB}^2\\{BD}^2=15^2+8^2=225+64=289\\BD=sqrt{289}=17,cm$

Panjang BE = $frac{1}{2}$ Panjang BD

$BE=frac{1}{2}times17\\BE=frac{17}{2}=8,5,cm$