How tall is a tree with a shadow of 12 feet
2007-04-02 10:31:18 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
real/shadow = real/shadow
3/9 = x/12
cross multiply...
3(12) = 9(x)
36 = 9x
4 = x
2007-04-02 10:34:43 · answer #1 · answered by Mathematica 7 · 0⤊ 0⤋
Its a simple proportion problem...
(3*12)/9
=4 feet
2007-04-02 17:38:57 · answer #2 · answered by jshaw0304 2 · 0⤊ 0⤋
Set up a proportion
pole/tree=pole's shadow/tree's shadow
3/t=9/12
cross multiply
36=9t
simplify
t=4
The tree is 4 feet high
2007-04-02 17:35:30 · answer #3 · answered by msmthtchr 3 · 0⤊ 0⤋
4 feet
3 is to 9 as X is to 12.
The ratio is 1/3
The answer is 4.
2007-04-02 17:35:51 · answer #4 · answered by me 2 · 0⤊ 0⤋
Just use a proportion.
3/9 = x/12
36=9x
4=x
4 feet --- It's little!
2007-04-02 17:34:27 · answer #5 · answered by ecolink 7 · 0⤊ 0⤋
4 ft
2007-04-02 17:34:11 · answer #6 · answered by Anonymous · 0⤊ 0⤋