Tentukan Panjang KM! mohon bantuannya yh kak:)

Tentukan Panjang KM! mohon bantuannya yh kak:)

$km = sqrt{ {6}^{2} - (4 sqrt{2} {)}^{2} } \ = sqrt{36 - 32} \ = sqrt{4} = 2$

menggunakan aturan cos:

ML = k = 6 cm

KL = m = 4√2 cm

KM = l

<L = 45°

l² = k² + m² – 2km.cos L

l² = 6² + (4√2)² – 2.6.4√2.cos 45°

l² = 36 + 32 – 48√2.√2/2

l² = 68 – 48

l² = 20

l = √20

l = 2√5 cm