Mr. Statler took his class to the local library 4 times last year. One student had a pedometer. She measured the trip as 1.7 km each way. How far did the students walk back and forth to the library during the year?

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times both sides by 2, times () by 8, add alile terms, move terms, add alike and caculate divide both sides by 3

answer: the angel abc is 30°,and the abc is a triangle where the angel bac is 90°

so ac is the half of 24=12ft,and from the pythagorean theorem we find ba

ba=√bc^2-ac^2=√576-144=√432=12√3ft

so bac is 12+12√3=12(1+√3)ft