Please help with this answer

67.  A square has four congruent (equal) sides so we just multiply the side we have by 4 for the perimeter:

Perimeter = 4(3 1/2) = 14

The area of a square is the side squared,

Area = (3 1/2)² = (7/2)² = 49/4 = 12 1/4

Perimeter 14 in, Area 12 1/4 sq inches.

70.

The volume of a rectangular prism is the product of the three sides lengths,

V = (2 1/8)(6 3/4)(2) = (17/8)(27/4)(2) = (17)(27)/16 = 459/16

459/16 cubic mm

x = central angle apc = measure of minor arc ac

the two angles x and 30 add to 180, so x+30 = 180 and x = 180-30 = 150. the measure of minor arc ac is 150 degrees.

what we need to do from here is find the circumference and then multiply it by x/360 since there are 360 degrees in a circle. in this case, x = 150, so x/360 = 150/360 = 15/36 = 5/12. the shortest distance along the curve from a to c is 5/12 of the distance around the entire circle (aka circumference)

c = circumference

c = pi*d

c = pi*24

c = 24pi

now multiply this by 5/12 to get

distance along minor arc ac = (5/12)*(circumference)

distance along minor arc ac = (5/12)*(24pi)

distance along minor arc ac = 10pi

the formula you can use is

l = (x/360)*pi*d

with

l = length of minor arc

x = central angle

d = diameter

which essentially is the steps we took though a bit differently.