# A 5-foot tall student stands 10 feet away from the lens of a camera. The film of the camera is 3 inches away from the lens. A 5 ft tall student is standing 10 feet away from the lens of a camera; behind the lens of the camera is shown the film of the camera, 3 inches away from the lens. What is the height of the film? Answer 0.2 inches 0.7 inches 1.2 inches 1.5 inches

6 years agoWas there a picture included with this?

6 years agoyes. one second

6 years agoWhat exactly is the topic of study for your class?

6 years agomeaning? Its geometry and that lesson was about similar triangles

6 years agoThat's what I needed to know

6 years agokk

6 years agoOkay, I figured out what it was, but the explanation is kind of whacky

6 years agoYou're supposed to create a proportion relating the two triangles by setting height of the person to the height of the film equal to the length of the person from the lens to the length of the film from the lens.

6 years agoright. I can get there but whats next?

6 years agodo I cross multiply?

6 years agoNext you cross multiply, then solve for x.

6 years agowait a second....

6 years agoWe need to convert feet to inches.

6 years agooh lord. I didnt notice that......

6 years agoYeah, I just realized it myself.

6 years ago1/40 = 5/x ??

6 years agox = 200.........right?

6 years agoSo after converting ft to inches, you get 60 for the height of the person 120 the person's distance from the lens So replacing those in the proportion you get: \[\frac{60}{x}=\frac{120}{3}\]

6 years agoJust kidding! geez my brain is fried

6 years ago\[\frac{60}{x}=40\]

6 years ago60 = 40x 6 = 4x 6/4 = x 2/3 = x

6 years agoin inches, not feet

6 years ago60/x = 40 x = 40/60 x = 4/6 x = 2/3 x = .67?

6 years agoYes

6 years ago.7 inches. Yay!! thank you!

6 years agowait, lol

6 years agouh oh.......lol

6 years agoI think I did that backwards

6 years ago3/2 = x

6 years ago60 = 40x 6 = 4x 6/4 = x 3/2 = x

6 years ago1.5??

6 years agoYes

6 years agothanks!

6 years agoFunny thing is, even if you don't convert, you still get 1.5 I find that very strange

6 years agoha

6 years agolol

6 years ago