Select the word from the list that best fits the definition

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

You eat $0.85 for every cup of hot chocolate you sell. how many cups do you need to sell to earn $55.25

The pyraminx is a rubik's cube-type toy in the shape of a tetrahedron. the pyraminx shown below has edges 15\,\text{cm}15cm long and vertical height h=12.2\,\text{cm}h=12.2cm. the triangle drawn with dashed lines is a right triangle. what is the distance rr? round your answer to the nearest tenth.