Question

pilnie potrzebne

Answer 1

1.

6² + x² = 9²

x² = 81 - 36

x² = 45

x = 3√5cm

 

2.

a² + c² = w²

 

(z - 2)² + (x + 1)² = (z + 5)²

 

3.

h = a√3 / 2 = 6√3 / 2 = 3√3 cm

 

4.

x² + 5² = 13²

x² = 169 - 25

x² = 144

x = 12cm

 

5.

6² + 4² = 7²

36  + 16 = 49

52 ≠49

Nie jets to trójkąt prostokątny.

 

6.

3/7 = 5/a

3a = 35

a = 35/3 = 11 i 2/3

 

3/7 = 2 / (2 + x)

3(2 + x) = 2 * 7

6 + 3x = 14

3x = 14 - 6

3x = 8

x = 8/3 = 2 i 2/3

 

7.

8² + 6² = a²

a² = 64 + 36

a² = 100

a = 10cm ---- bok równoległoboku

P = 2 * 1/2 * a * h = 2 * 1/2 * 8 * 6 = 48cm²

Ob = 2*(10 + 8) = 2 * 18 = 36cm