I need help I don’t understand how to do it

7.2 inches

Step-by-step explanation:

area of a rhombus = base x height

to find the base (length) of the rhombus you rearrange this equation so that it becomes

base = area / height

base =  21.6in² /  3

base (length) = 7.2in

hope this helps :)

b

step-by-step explanation:

it have 5 sides and 5 identicle angle.the rest does not have the same property as b.

brainliest

hi! i think the answer is 1/2 : )