Math

posted by Jennifer

A large pizza has a total diameter of 14 inches and a cross that is 1 inch wide. What is the area of the crust? Round to the nearest tenth.

1. Ms. Sue

??a cross that is 1 inch wide???

2. Jennifer

Crust*

3. Ms. Sue

A = pi * r^2

A = 3.14 * 49

A = ?

4. Jennifer

The answer has to be 40.8 in.

5. Ms. Sue

Why?

3.14 * 49 = 153.86 = 153.9 square inches

6. Jennifer

Because I need to find the area of the crust not the whole pizza. The answers in the back on my book say it should come to 40.8 inches, but I don’t know how to solve it.

7. Jennifer

40.8 square inches*

8. Ms. Sue

A pizza crust has the same area that the whole pizza has.

9. Damon

LOL, I think she just wants the part you see from above
If D is 14 then the slimy area has diameter of 12 because you take and inch off each side.
so
area of a circle = pi d^2/4
(pi/4)(14^2-12^2)
sure enough 40.8

10. Ms. Sue

Ahh -- thanks Damon.

11. Jennifer

Lol ok thank you!!

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