The formula for the area of a circle is a pi r^2 what is the radius of a circle with an area of 400 pi cm^2

20 cm

Step-by-step explanation: Isolate the variable by dividing each side by factors that don't contain a variable.

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.

just get this app called photo math it should be able to do those