# Circles

The areas of the two circles are in the ratio 2:20. The larger circle has a diameter 20. Calculate the radius of the smaller circle.

## Correct answer:

Tips for related online calculators

Check out our ratio calculator.

Do you have a linear equation or system of equations and are looking for its solution? Or do you have a quadratic equation?

Do you have a linear equation or system of equations and are looking for its solution? Or do you have a quadratic equation?

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

#### Units of physical quantities:

#### Grade of the word problem:

We encourage you to watch this tutorial video on this math problem: video1

## Related math problems and questions:

- Calculate 3167

The area of the two circles is in a 4: 9 ratio. The larger circle has a diameter of 12 cm. Calculate the radius of the smaller circle. - Calculate 12061

The area of the two circles is in a 4:9 ratio. The larger circle has a diameter of 18 cm. Calculate the radius of the smaller circle. - Diameters of circles

How many percent of the area of a larger circle is a smaller circle if the smaller circle has a diameter of 120 mm and a larger one has a diameter of 300 mm? - Quatrefoil 81138

Gothic quatrefoil is an ornament in which four identical touching smaller circles are inscribed in a larger circle, as you can see in the picture. The radius of the great circle is one meter. Calculate the radius of the smaller circle in meters.

- Annulus

Two concentric circles form an annulus of a width of 10 cm. The radius of the smaller circle is 20 cm. Calculate the area of the annulus. - Ratio of squares

A circle is given in which a square is inscribed. The smaller square is inscribed in a circular arc formed by the square's side and the circle's arc. What is the ratio of the areas of the large and small squares? - Annulus

The radius of the larger circle is 8cm, and the radius of the smaller is 5cm. Calculate the area of the annulus. - Circumference 3589

Calculate the circle's radius if the circumference and area are in a 2:5 ratio. - Circle annulus

There are two concentric circles in the figure. The chord of the larger circle, 10 cm long, is tangent to the smaller circle. What does annulus have?

- Circumference 8395

The circle's circumference is 321 dm larger than the diameter of the circle. What is the average? - The ratio

The ratio of the lengths of the two circles is 5:2. Find the ratio of a a) the radii of these circles b) the areas for these circles - Square and circles

The square in the picture has a side length of a = 20 cm. Circular arcs have centers at the vertices of the square. Calculate the areas of the colored unit. Express area using side a. - Concentric circles

In the circle with diameter, 13 cm is constructed chord 1 cm long. Calculate the radius of a concentric circle that touches this chord. - Difference 80618

A regular hexagon is described and inscribed in a circle. The difference between its areas is 8√3. Find the circle's radius.

- Diameter

If the endpoints of the diameter of a circle are A(-9, 10) and B (-5, -4), what is the circle's radius? - Quadrilateral 78874

Given is a quadrilateral ABCD inscribed in a circle, with the diagonal AC being the circle's diameter. The distance between point B and the diameter is 15 cm, and between point D and the diameter is 18 cm. Calculate the radius of the circle and the perime - Radius of the circle

Calculate the radius of the circle whose length is 107 cm larger than its diameter