2010014609 | math4u.vsb.cz

SubArea:

Level:

Project ID:

2010014609

Source Problem:

Accepted:

0

Clonable:

1

Easy:

0

Find the angle

φ

between the lines

2 x + 1 = 0

and

x - y + 7 = 0

.

45^{\circ}

60^{\circ}

90^{\circ}

30^{\circ}