Question

1.Raza unui cerc are 3 cm calculati lungimea si aria arcului

2.Calculati volumul unui paralelipiped alegand-va dimensiunile

3.Calculati volumul unui con alegandu-va dimensiunile

4.Alegeti un corp geometric si calculatii aria bazei si volumul folosind dimensiunile date de voi (am ales cub)

Ajutor urgent dau fundaa

Answer 1

Răspuns:

1.

Lungimea cerc = 2×pi×R = 6pi

Aria cerc = pi×R^2 = 9pi

2.

V = L×l×h

3.

V = Aria bazei × h/3 = pi×R^2×h/3

4.

Aria pătrat = L^2

Volum cub = L^3

Answer 2

$\bf1.\ \ \it L_c=2\pi R=2\pi\cdot3=6\pi\ cm\\ \\ \bf 2.\ \it L=10cm,\ \ \ell = 8cm,\ \ h=20cm\ \ \ \mathcal{V}=L\cdot \ell \cdot h=10\cdot8\cdot20=1600\ cm^3\\ \\ \bf 3.\ \it R=3cm,\ h=10cm,\ \mathcal{V}=\dfrac{\pi R^2 h}{3}=\dfrac{\pi\cdot3^2\cdot10}{3}=\dfrac{90\pi}{3}=30\pi\ cm^3\\ \\ \bf 4.\ \it a=5cm\ muchia\ cubului,\ \mathcal{A}_b=a^2=5^2=25cm^2,\ \mathcal{V}=a^3=5^3=125cm^3$