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## nuccioreggie one year ago The image below is a triangle drawn inside a circle with center O: A triangle is shown inscribed inside a circle. The leg of the triangle labeled 8 inches passes through the center of the circle, O. The other two legs are labeled as 4 inches and 5 inches. Which of the following expressions shows the area, in square inches, of the circle? (π = 3.14) 3.14 ⋅ 42 3.14 ⋅ 52 3.14 ⋅ 5 3.14 ⋅ 22

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1. nuccioreggie

@Michele_Laino

2. nuccioreggie

is A correct?

3. Michele_Laino

I'm thinking...

4. nuccioreggie

u think it A?

5. Michele_Laino

is your drawing like this? |dw:1439566709975:dw|

6. Michele_Laino

@nuccioreggie

7. nuccioreggie

NO I WILL SHOW U

8. Michele_Laino

ok!

9. nuccioreggie

10. nuccioreggie

THERE

11. Michele_Laino

yes! I asked for that drawing, because my drawing it is impossible, since a traingle inscribed like mine has to be a right triangle

12. Michele_Laino

triangle*

13. nuccioreggie

so A

14. Michele_Laino

here we can compute the area of our triangle, using the Eron's formula

15. nuccioreggie

is A correct ?

16. Michele_Laino

the half-perimeter of our triangle is: p=(8+4+5)/2=...?

17. nuccioreggie

why u neveranswer my question is it A?!

18. nuccioreggie

14.5

19. Michele_Laino

please wait a moment I check your answer

20. nuccioreggie

OK

21. nuccioreggie

DID YOU GET IT

22. Michele_Laino

sorry, the area of a circle is: pi*radius^2=3.14*4*4=...? since the diameter is 8 inches, then radius= 4 inches

23. nuccioreggie

3.14 .42

24. Michele_Laino

it is: $3.14 \cdot {4^2}$

25. Michele_Laino

it is 4^2 not 42

26. nuccioreggie

OK

27. Michele_Laino

ok!

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