Question

Măcar primele 5 probleme, vă rog eu mult , dau şi coroană , vă rogggg .​

Answer 1

Răspuns:

Explicație pas cu pas:

1.

d^2 = l^2 + l^2 = 2l^2

d = l√2

2.

d = l√2

a) 4√2 cm

b) 18√2 cm

c) 7√6 cm

d) 18 cm

3.

d = l√2

l =d/√2 = d√2/2

a) 12√2*√2/2 = 12 cm

b) 10√2/2 = 5√2 cm

c) 24√3*√2/2 = 12√6 cm

d) 9√10*√2/2 = 9√20/2 = 9*2√5/2 = 9√5 cm

4.

h^2 = l^2 - (l/2)^2 = l^2 - l^2/4 = 4l^2/4 - l^2/4 = 3l^2/4

h = l√3/2

5.

h = l√3/2

a) 8*√3/2 = 4√3 cm

b) 6√3*√3/2 = 9 cm

c) 15√2*√3/2 = 15√6/2 cm

d) 8√3/3*√3/2 = 4 cm

6.

h = l√3/2

l = 2h/√3 = 2h√3/3

a) 2*14√3*√3/3 = 28 cm

b) 2*6√3/3 = 4√3 cm

c) 2*18√2*√3/3 = 12√6 cm

d) 2*15√6*√3/3 = 30√2 cm

8.

Triunghi dreptunghic isoscel = fiecare cateta are 12 cm

I = ipotenuza

I^2 = 12^2 + 12^2 = 144 + 144 = 288

I = √288 = 12√2 cm

9.

I^2 = C^2 + C^2 = 2C^2

C^2 = I^2/2

C = I/√2 = I√2/2 = 8√3*√2/2 = 4√6 cm