The radius of a circle is 3 centimeters. What is the length of a 45 arc

Which graph has figures that can undergo a similarity transformation to justify that they are similar? (obviously not the third one)

Which equation can be used to measure the density of water in a spherical water tank? let w represent the number of water particles within the region.

Acentral angle measuring 160 degrees intercepts an arc in a circle whose radius is 4. what is the length of the arc the circle formed by this central angle? round the length of the arc to the nearest hundredth of a unit. a) 4.19 units b) 6.28 units c) 12.57 units d) 12.57 square units