## mayrabris2cute 2 years ago Find the area of the irregular shape. Round to the nearest tenth. PIC: http://www.mediafire.com/view/?67m8kuz77hcttep Answers: a. 90.2 cm² b. 241 cm² c. 65.1 cm² d. 72.3 cm²

1. mayrabris2cute

2. mathstudent55

You have an 8-cm by 5-cm rectangle plus a half circle with 4 cm radius. Do you know the folrmulas for the areas of a rectangle and a circle?

3. mayrabris2cute

I know formula for the area of a circle....

4. mathstudent55

Ok, so you need half the area of a circle with radius 4 cm. The area of a rectangle is A = LW, where L = length and W = width

5. mayrabris2cute

A = pi x r^2

6. mathstudent55

Right. Calculate that and divide by 2 because you have only half a circle. Then add that to A = LW, with L = 8 cm and W = 5 cm, which is the area of the rectangle.

7. mayrabris2cute

I really need to hurry!!!! I can't in time!!!!!

8. mayrabris2cute

3.15 * 8 = 25.2

9. mathstudent55

|dw:1358454216136:dw|

10. mayrabris2cute

Oh no! I have to go! I'll just get the answer wrong :/

11. mayrabris2cute

Yes....

12. mathstudent55

That's good. You have the area of the half circle. Now you need to calculate the area of the rectangle and add the two areas.

13. mayrabris2cute

So 40 + 25.2 = 65.3. That's the answer?

14. mayrabris2cute

But 65.3 isn't an answer choice.

15. mathstudent55

40 + 25.1 = 65.1

16. mathstudent55

You got it! Good work.

17. mayrabris2cute

The answer is 6.1. I just did it and got it right!

18. mayrabris2cute

Alright! Thx! :D

19. mathstudent55

wlcm