find the missing length of two similar rectangles. first one L= n meters and W= 8 meters. second one L=15 meters and W=10 meters.
possible choices...13m, 16.75m, 10m, 12m
find the missing length of two similar rectangles. first one L=n inches and W=16 inches. second one L= 15 inches and W=12 inches.
possible choices...11.25in, 19in, 20in, 12.8in
2006-06-28 07:17:54 · 4 answers · asked by Anonymous in Education & Reference ➔ Homework Help
You can solve this using proportions. If the rectangles are similar, then the ratio of length to width is the same for both rectangles.
For the first problem, n/8 = 15/10
Cross multiply to get 10n = 15*8
10n = 120
n = 12 meters
For the second problem, n/16 = 15/12
Cross multiply to get 12n = 15*16
12n = 240
n = 20 inches
If you want to make these problems a little easier, try simplifying the ratio that you know before you cross-multiply.
2006-06-28 07:24:48 · answer #1 · answered by mathsmart 4 · 0⤊ 0⤋
1) n/8=15/10. Now cross multiply
n*10=8*15
10n=120. Now divide both sides by 10
n=120/10=12
2)n/16=15/12. Now cross multiply
12n=15*16
12n=240. Now divide both sides by 12
n=240/12=20
2006-06-28 07:25:35 · answer #2 · answered by Cara B 4 · 0⤊ 0⤋
1) 12m
2) 20in
2006-06-28 07:22:28 · answer #3 · answered by anonymous 6 · 0⤊ 0⤋
12m , 20in
2006-06-28 07:23:43 · answer #4 · answered by Joe K 2 · 0⤊ 0⤋