# Angle between lines

Calculate the angle between these two lines:

$p:−4x+7y+7=0$

$q:−x+4y+7=0$

$p:−4x+7y+7=0$

$q:−x+4y+7=0$

## Correct answer:

Tips for related online calculators

The line slope calculator is helpful for basic calculations in analytic geometry. The coordinates of two points in the plane calculate slope, normal and parametric line equation(s), slope, directional angle, direction vector, the length of the segment, intersections of the coordinate axes, etc.

See also our trigonometric triangle calculator.

Try conversion angle units angle degrees, minutes, seconds, radians, grads.

See also our trigonometric triangle calculator.

Try conversion angle units angle degrees, minutes, seconds, radians, grads.

### You need to know the following knowledge to solve this word math problem:

**geometry**- analytic geometry
- line
**arithmetic**- absolute value
**planimetrics**- triangle
**goniometry and trigonometry**- cosine
- tangent
- arctangent

### Units of physical quantities:

### Grade of the word problem:

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