A 9-foot roll of waxed paper costs $2.16. What is the price per inch?
2 answers:
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Answer:
ST = 12 units
Step-by-step explanation:
Δ RAS and Δ TES are similar triangles, thus the ratios of corresponding sides are equal, that is, noting that SR = 21 - ST, thus
=
substitute values
=
( cross- multiply )
6ST = 8(21 - ST)
6ST = 168 - 8ST ( add 8ST to both sides )
14ST = 168 ( divide both sides by 14 )
ST = 12
Check the picture below.
so the lateral area will be just the area of the sides, namely excluding the bases at top and bottom, thus
