Radius Word Problems

A large pizza has a diameter 35cm. Two large pizzas cost $19.99. A medium pizza has a diameter 30 cm. Three medium pizzas cost $24.99. Which is the better deal: 2 large pizzas or 3 medium pizzas?
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From a space probe orbiting Jupiterâ€™s moon Io from an altitude of 552 km, it was observed that the angle of depression from the probe to the surface of this moon was 39.7 degrees. What is the radius of the moon, Io?
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According to Kep;er`s third law of planetary motion, the radyo T^2/R^3 has the same value for every planet in our solar system. R is the average radius of the orbit of the planet measured in astronomical units(AU), and T is the number of years it takes for one complete orbit of the sun. Jupiter orbits the sun in 11.86 years with an average radius of 5.2 AU, whereas Saturn orbits the sun in 29.46 years. Find the average radius of the orbit of Saturn.(One AU is the distance from the earth to the sun.)
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The distance from Philadelphia to Sea Isle City is 100 mi. A car was driven this distance using tires with a radius of 14 in. How many revolutions of each tire occurred on the trip?
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A man has 3 spheres solid and small. The radius are 2 mm, 3mm and 4 mm. He melted all the spheres and make one sphere. What is the radius of the new sphere?
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In the figure below, both circles have the same center, and the radius of the larger circle is R. If the radius of the smaller circle is 3 units less than R, which of the following represents the area of the shaded region?
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the combined area of two circles is 80 pie centimeters. the length of the radius of one circle is twice the length of the radius of the other circle. find the legth of the radius of each circle.

A chord of a circle 20 inches long is 24 inches from center find length of circle