are of a circle=pie r squared. So first find the area using the diameter. half of 3.5 is 1.75. 1.75 squared is 3. 06. 3.14 times 3.06 is 9.61. Now find half of that which is 4.81
If you don't know what the variable is before you do the equation, you'll end up with an answer that doesn't make sense.<span />
The answer is the first one: 1 1/5 because 120/100 = 1.2
