The radius of a circle is 9 centimeters. What is the area of the circle? Use 3.14
for at

254.34cm²

Step-by-step explanation:

Area of a circle = π r²

Where r = radius of the circle = 9cm , π = 3.14

Therefore

Area = π r² = 3.14 × 9²

Area = 3.14 × 81

Area = 254.34cm²

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because they could drop even lower..

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.