Can someone help me with these questions ASAP!!

Step-by-step explanation:

Formula of the circumference of  the circle is 2*pi*r

1.A=pi*r^2=pi*3^2=9pi

2.A=pi*10.8^2=

3.r=14/2=7 so

A=pi*7^2=49pi

4. A=pi*(31/2)^2Km^2=15.5^2*pi

5.  semicircle

 A=pi*16^2/2cm^2=

6.A=pi*(22.6/2)^2=11.3^2*pi

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it

can you complete your sentence? i could !