Answer:

Step-by-step explanation:
we are given r and the formula
we want to find the surface area of the shpare with the given r
to do so
we need our algebra skills
substitute the value of r:

recall law of exponent

to simplify:

simplify multiplication:

distribute:

hence our answer is F
A = bh
12 = 4 × h [substitute A for 12 and b for h]
12 / 4 = h
3 = h
Therefore, h equals 4.
Answer:
hope it is helpful to you
Answer: 2.25 km
Step-by-step explanation:
2 cm = 0.5 km
9 cm = (9 x 0.5)/2
= 2.25 km