1103061406

Level: 
Project ID: 
1103061406
Accepted: 
1
Clonable: 
0
Easy: 
0
The rectangular box \( ABCDEFGH \) has sides of lengths \( |AB|=6\,\mathrm{cm} \), \( |BC|=4\,\mathrm{cm} \), \( |AE|=8\,\mathrm{cm} \). Find the angle between the planes \( ABC \) and \( EFC \) (see the picture). Round the result to two decimal places.
\( 63.43^{\circ} \)
\( 26.57^{\circ} \)
\( 45^{\circ} \)
\( 56.2^{\circ} \)