Geometrymedium · Past Paper
Two circles touch internally. Their radii are 10 cm and 4 cm. What is the distance between their centers?
A14 cm
B6 cm
C7 cm
D4 cm
✓ Correct Answer: B — 6 cm
For internal touching, the distance between centers is the difference of radii: 10 - 4 = 6 cm.
Share this question
More from Geometry
- Which of the following is always true for the orthocenter of an obtuse triangle?
- An equilateral triangle ABC is inscribed in a circle. What is the angle subtended by side AB at the center?
- The equation of the normal to the circle x^2 + y^2 = 25 at (3, 4) is:
- If the line y = mx + c is a tangent to the circle x^2 + y^2 = a^2, then the condition is:
- If two angles of a triangle are 50 and 70 degrees, what is the third angle?