Geometryeasy · Past Paper
If the slope of two lines are m1 and m2, what is the condition for them to be parallel?
Am1 * m2 = -1
Bm1 = m2
Cm1 + m2 = 0
Dm1 = -m2
✓ Correct Answer: B — m1 = m2
Parallel lines have the same steepness, so their slopes must be equal (m1 = m2).
Share this question
More from Geometry
- Find the radius of the circle (x-1)^2 + (y+2)^2 = 16.
- If the lines 2x + ky + 3 = 0 and 4x + 6y + 9 = 0 are parallel, then k is:
- If an angle is 275 degrees, what type of angle is it?
- What is the angle between the lines y = x and y = -x?
- The ratio of the corresponding altitudes of two similar triangles is 3:4. What is the ratio of their areas?