A circle has a circumference of 7,850. What is the radius of the circle?

Collin did the work to see if 10 is a solution to the equation r/4=2.4

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.

How do you write 0.5% as a fraction