Level:
Project ID:
1003077001
Accepted:
1
Clonable:
0
Easy:
0
A triangle has sides whose lengths are \( 6\,\mathrm{cm} \), \( 7\,\mathrm{cm} \) and \( 9\,\mathrm{cm} \). Find cosine of its largest interior angle.
\( \frac1{21} \)
\( 87.27^{\circ} \)
\( 1.98 \)
\( -\frac1{21} \)