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Mathematics 20 Online
OpenStudy (anonymous):

anyone can help please??? look at the figure below Which expression is equal to ab/rq

OpenStudy (anonymous):

OpenStudy (anonymous):

AWNSERS PQ/PB PA/PR PQ/PA AR/AB

jimthompson5910 (jim_thompson5910):

Hint: triangles PAB and PRQ are similar So the corresponding sides are in proportion with one another So AB/RQ = PA/PR AB/RQ = PB/PQ etc etc

OpenStudy (anonymous):

K... SO is it c????

jimthompson5910 (jim_thompson5910):

no

OpenStudy (anonymous):

PA/PR

OpenStudy (phi):

ab/rq is the ratio of little triangle to big triangle. look for a side of the little triangle to its corresponding side in the big triangle

OpenStudy (phi):

pq/pb are corresponding sides, but it's big to little (we want little to big)

OpenStudy (phi):

pa/pr that looks good.

OpenStudy (anonymous):

ohhh okay i got it now , is it b

jimthompson5910 (jim_thompson5910):

yes

OpenStudy (phi):

pq/pa do not correspond

OpenStudy (phi):

ditto ar/ab. do not correspond

OpenStudy (anonymous):

alright i get it know thanks guyzz :) <3

OpenStudy (anonymous):

wanna help me with anopther one ??:)

jimthompson5910 (jim_thompson5910):

sure

jimthompson5910 (jim_thompson5910):

go ahead and ask

OpenStudy (anonymous):

k hold up

OpenStudy (anonymous):

Triangle PQR is similar to triangle ABC in the figure below What is the perimeter of triangle ABC 10.5 inches 39.9 inches 42.0 inches 60.65 inches

jimthompson5910 (jim_thompson5910):

First solve x/3 = 17.5/5 for x to find the length of AC

OpenStudy (phi):

step 1. is find AC if the triangles are similar then the length of the side of the big triangle = some number times the length of the little one: B= k * L 14= k* 4 find k then use it to find AC AC= k*3

OpenStudy (anonymous):

42 inches

OpenStudy (anonymous):

ok ill work it out thanks so muchhhh, ur a genius :))

OpenStudy (phi):

or use ratio's like jt shows

OpenStudy (phi):

step 2: add up the lengths to get the perimeter

OpenStudy (phi):

Thinking about it, ratios are nice, once you get the hang of them

OpenStudy (anonymous):

it's gonna be 42 correct? and yea i jjust gotta keep working on it

OpenStudy (phi):

yes

OpenStudy (anonymous):

::D whoop whoop i get it thxs

jimthompson5910 (jim_thompson5910):

yes, x/3 = 17.5/5 5x = 3*17.5 5x = 52.5 x = 52.5/5 x = 10.5 So AC = 10.5 So the perimeter is 14+17.5+10.5 = 42

OpenStudy (anonymous):

k thxs jim :)

jimthompson5910 (jim_thompson5910):

yw

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