Răspuns:
Explica pas cu pas:
AM / AB = 40% / 100%
AM / BC = 2 / 5
AM / 25 = 2 / 5
AM = 10
MN = BC - AM
MN = 25 - 10
MN = 15
Pmna = MN + MA + AN
Pmna = 15 + 10 + 40% din 20
Pmna = 15 + 10 + 8
Pmna = 33 cm
Răspuns:
Explicație pas cu pas:
BC² = AC² + AB²
625 = 400 + AB²
AB² = 625 - 400 = 225
AB = 15 cm
AN = AC*40/100
AN/AC = 40/100 = 2/5
MN ll BC ⇒ AN/AC = AM/AB = MN/BC
AN/20 = 2/5
AN = 20*2/5 = 8 cm
AM/15 = 2/5
AM = 15*2/5 = 6 cm
MN/25 = 2/5
MN = 25*2/5 = 10 cm
P ΔMNA = AN + AM + MN = 8 + 6 + 10 = 24 cm
