Geometryhard · Past Paper
If the line y = mx + c is tangent to the circle x^2 + y^2 = r^2, then:
Ac^2 = r^2(1 + m^2)
Bc^2 = r^2(1 - m^2)
Cc = r*m
Dc = r/m
✓ Correct Answer: A — c^2 = r^2(1 + m^2)
This is the condition of tangency for a line and a circle centered at the origin.
Share this question
More from Geometry
- If the area of a circle is A, and its circumference is C, then which of the following is true?
- The coordinates of the midpoint of the line segment joining (a, b) and (-a, -b) are:
- The area of a circle inscribed in a square of side 10 cm is:
- An angle measuring 95 degrees is classified as:
- Point of intersection of x + y = 2 and x - y = 0 is: