katlin95
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
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katlin95
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@e.cociuba
katlin95
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|dw:1364426784027:dw|
find the mRF if m angle FNR= 38 degrees
katlin95
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A. 284 degrees
B. 142 degrees
C. 38 degrees
D. 76 degrees
@jim_thompson5910 can u help with these two?
jim_thompson5910
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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
jim_thompson5910
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so you can use that to find the actual distance x that 3 inches represents on a map
katlin95
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okay for the first one I got B as my answer and the second question I got C
jim_thompson5910
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why B for the first one?
jim_thompson5910
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you know the distance on the paper map, it's 7 inches
it's not z inches
jim_thompson5910
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z is the unknown distance in real life from point A to point B that the 7 inches represents on the paper map
katlin95
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oh haha I ment A sorry!
jim_thompson5910
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|dw:1364427190413:dw|
jim_thompson5910
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i meant to write z miles, not z inches
jim_thompson5910
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but hopefully you get the idea
jim_thompson5910
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the scale is this
|dw:1364427313903:dw|
katlin95
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oh first on is C huh?
jim_thompson5910
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put the two side by side to get
|dw:1364427383477:dw|
katlin95
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yep so its C!:)
jim_thompson5910
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yep, C it is
jim_thompson5910
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1 inch/10 miles = 7 inches/z miles
or just
1/10 = 7/z
katlin95
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alright how about second one?
jim_thompson5910
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we want arc RF, so we need to find central angle FDR
jim_thompson5910
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to find the central angle, you use the inscribed angle theorem
jim_thompson5910
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this central angle here
|dw:1364427601352:dw|
jim_thompson5910
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is equal to 2 times any inscribed angle which cuts off the same arc
katlin95
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alright so my answer would be D
jim_thompson5910
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yep 76
katlin95
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thanks!