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Fittoniya [83]
2 years ago
5

The perimeter of the square piece of gold is 12 milllimeter. how long is each side

Mathematics
1 answer:
Firdavs [7]2 years ago
4 0
48 mm long

Since a square has all equal sides, it will be 12mm for all sides

Perimeter = L (Length) + W (Width) + L + W
(In this case since it’s a 2D shape)

12 + 12 + 12 + 12 = 48

Hope this helped :)
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3 years ago
An object is placed 21 cm from a concave lens of focal length 25 cm. what is the magnification?
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The magnification is 0.54

Given,

The distance between object and concave lens, u = -21 cm

Focal length of the concave lens, f = -25 cm

Let m be the magnification.

m = v/u

Here v is the position of image.

We have to find v first.

By using lens equation we can determine v.

That is,

1/f = 1/v – 1/u

So,

- (1/25) = 1/v – (-1/21)

- (1/25) = 1/v + 1/21

1/v = - (1/25) – 1/21

1/v = (-25 – 21) / (21 x 25)

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Therefore v = - (525/46)

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Learn more about concave lens here: brainly.com/question/12944945

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