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A circle is inscribed in a right-angled triangle with sides 6, 8, and 10. Find its radius.
If the circumference of a circle is increased from 4*pi to 8*pi, what happens to its area?
In the figure, if chord AB is parallel to tangent at C, then triangle ABC is:
The length of a transverse common tangent to two circles of radii 8 cm and 2 cm with centers 13 cm apart is:
If a rectangle is inscribed in a circle, its diagonal is always the:
How many common tangents can be drawn to two circles that do not intersect and one is not inside the other?
A wire in the form of a circle of radius 42 cm is cut and bent into a square. Find the side of the square.
What is the locus of the center of a circle which touches a given line at a given point?
A chord AB of a circle divides it into two segments. If the angle in the minor segment is 120 degrees, what is the angle in the major segment?
In a circle with center O, the measure of central angle AOB is 80 degrees. If the area of sector AOB is 16*pi, what is the radius?
The angle between a tangent and its radius is always constant. What is that constant?
What is the relationship between the radius (r) and the diameter (d) of a circle?
If the radius of a circle is 7 cm, what is its circumference? (Take pi = 22/7)
What is the area of a circle with a diameter of 14 cm? (Take pi = 22/7)
What is the degree measure of an angle inscribed in a semi-circle?
If two circles have the same center but different radii, they are called:
What is the sum of opposite angles in a cyclic quadrilateral?
A line segment joining any two points on the circumference of a circle is called:
If the circumference of a circle is 132 cm, find its radius. (Take pi = 22/7)