Posted by **Debbie** on Tuesday, December 9, 2008 at 7:56pm.

A tree casts a shadow that measures 5 m. At the same time, a meter stick casts a shadow that is 0.4 m long. How tall is the tree?

Is this correct ?

1m=.4m

1m÷.4m =2.5m

2.5m X 5m =12.5m

- math 115 CH 7 -
**Reiny**, Tuesday, December 9, 2008 at 8:08pm
they probably wanted you to set up 2 similar triangles and set up a ratio.

let the height of the tree be h m

then h/5 = 1/.4

cross-multiply to get .4h=5

h=5/.4 = 12.5 m

so the tree is 12.5 m high.

I know you got that numerical answer but I didn't like the way you made your statements

e.g.

1m = .4m makes no sense, 1m cannot be .4m

(I know this might seem petty, but to mathematicians this is just as grating as bad grammar is to an English teacher.)

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