## katlin95 2 years ago On a map, the key states that 1 inch equals 10 miles. If you want to calculate how many miles is equivalent to 7 inches, which proportion would you use? A.the fraction 10 inch over 1 miles equals the fraction 7 inches over z miles B. the fraction 1 inch over 10 miles equals the fraction z inches over 7 miles C. the fraction 1 inch over 10 miles equals the fraction 7 inches over z miles D. the fraction z inch over 10 miles equals the fraction 7 inches over 1 miles

1. katlin95

@e.cociuba

2. katlin95

|dw:1364426784027:dw| find the mRF if m angle FNR= 38 degrees

3. katlin95

A. 284 degrees B. 142 degrees C. 38 degrees D. 76 degrees @jim_thompson5910 can u help with these two?

4. jim_thompson5910

Similar example: if 1 inch = 50 miles then 3 inches on a map would mean... 1 inch/50 miles = 3 inches/x miles or just 1/50 = 3/x

5. jim_thompson5910

so you can use that to find the actual distance x that 3 inches represents on a map

6. katlin95

okay for the first one I got B as my answer and the second question I got C

7. jim_thompson5910

why B for the first one?

8. jim_thompson5910

you know the distance on the paper map, it's 7 inches it's not z inches

9. jim_thompson5910

z is the unknown distance in real life from point A to point B that the 7 inches represents on the paper map

10. katlin95

oh haha I ment A sorry!

11. jim_thompson5910

|dw:1364427190413:dw|

12. jim_thompson5910

i meant to write z miles, not z inches

13. jim_thompson5910

but hopefully you get the idea

14. jim_thompson5910

the scale is this |dw:1364427313903:dw|

15. katlin95

oh first on is C huh?

16. jim_thompson5910

put the two side by side to get |dw:1364427383477:dw|

17. katlin95

yep so its C!:)

18. jim_thompson5910

yep, C it is

19. jim_thompson5910

1 inch/10 miles = 7 inches/z miles or just 1/10 = 7/z

20. katlin95

alright how about second one?

21. jim_thompson5910

we want arc RF, so we need to find central angle FDR

22. jim_thompson5910

to find the central angle, you use the inscribed angle theorem

23. jim_thompson5910

this central angle here |dw:1364427601352:dw|

24. jim_thompson5910

is equal to 2 times any inscribed angle which cuts off the same arc

25. katlin95

alright so my answer would be D

26. jim_thompson5910

yep 76

27. katlin95

thanks!

28. jim_thompson5910

yw

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