Question

1. Fie punctele A, B, C, D astfel incat B ∈ (AC), C ∈ (BD), AB = 2 cm; AC = 4,5 cm; BD = 3 cm. Calculati lungimile segmentelor [BC], [AD] si [CD]

2. Punctele O, A, B, C, D, E sunt situate pe dreapta d, in aceasta ordine. Se stie ca OA = 2,5 cm, OB = 4 cm, OC = 5,5 cm, OD = 7 cm si OE = 8,5 cm. Aflati lungimile segmentelor: [AB]; [BC]; [CD]; [AC]; [BD]; [AE]; [CE].

3. Desenati punctele A, B C, D astfel incat B ∈ (AC), C ∈ (BD), AB = 3,2 cm;
BC = 1.6 cm; CD = 6,5 cm. Aflati lungimile segmentelor (AC), (AD), (BD).

4.In figura 38 avem : AB = 2,1 cm; BC = 1,6 cm; CD = 2,7 cm; DE = 0,6 cm;
EF = 1,4 cm. Aflati lungimile segmentelor: [AC]; [AD]; [BD]; [DF]; [BE]; [BF].

figura 38 : |------|-----|------------------|----|------|
A B C Fig.38 D E F

Va rog ajutati-ma :) Dau coroana

Answer 1

1) BC=AC-AB=2.5
    AD=AB+BD=5
   CD=BD-BC=0.5

2) AB=OB-OA=1.5
BC=OC-OB=1.5
CD=OD-OC=1.5
AC=OC-OA=3
BD=OD-OB=3
AE=OE-OA=6
CE=OE-OC=3

3)AC=AB+BC=4.8
AD=AC+CD=10.9
BD=BC+CD=8.1

4)AC=AB+BC=3.7
AD=AC+CD=6.4
BD=BC+CD=4.3
DF=DE+EF=2
BE=BC+CD+DE=4.9
BF=BE+EF=6.3