Yo please help i have no idea how to do this(the first 2 questions the tecaher did)

Step-by-step explanation:

You'll need to learn the formula for the circumference of a circle.  If the radius is r, the circumference C is C = 2πr.  It appears that your teacher is using pi for the exact circumference and 3.14 for the approximate circumference.

The radius of the first circle is 5 in.  Thus, the exact circumference is

C = 2πr = 2π(5 in) = 10π in, and the approximate circumference is

C = 2(3.14)(5 in) = 31.4 in

14

step-by-step explanation:

14 x 3 = 42

the answer is 54 sq. ft. i just did this question, on odyssey ware, and it was right. make brainliest.