Can you explain ? i’m kind of in a crunch

The 7 cm side of the rectangle also serves as the radius of the circle

The problem wants us to take the area of the rectangle and subtract it by each of the 3 semicircles

The area of a full circle is:

SEMICIRCLE:

So the area of a semicircle is half of that:

All 3 of these semicircles have the same area so once we find the area of one, all we have to do it multiply it by 3:

The area of one semicircle is 38.465 so 3 of them would be 115.395cm

RECTANGLE:

The area of a rectangle is equal to length • width

The width is given as 7cm and we can find the length by remembering that the radius of each semicircle is 7cm and since there are 3 semicircles we know the length of the rectangle is 21 cm

Making the area of the rectangle 7cm • 21cm which equals 147cm

Now we take 147cm and subtract it by 115.395cm and we are left with 31.605cm^2 I believe

My Best Guess: 31.605cm ^2

for finding the midpoint of any given 2 pair of points simply add the respective x coordinates with other x coordinate and the y coordinate with other y coordinate and divide them by 2

in your question it will be :

(3+1)/2 for the x coordinate of mid point i.e 2

[8+(-4)]/2 for the y coordinate of midpoint i.e 2

so coordinates of mid point of points (3,8) and (1,-4) will be (2,2)