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# Please help! If the telescope is 9 m deep and 12 m wide, how far is the focus from the vertex?

**Solution:**

Depth of the Telescope = 9 m

Width of the telescope = 12 m

The shape of the telescope is parabola

Parabolic equation is x^{2} = 4ay

Here x = 9 and y = 6

9^{2} = 4 × a × 6

By further calculation

81 = 24a

a = 81/24

So we get

a = 27/8

a = 3.375 m

Therefore, the focus is 3.375 m far from the vertex.

## Please help! If the telescope is 9 m deep and 12 m wide, how far is the focus from the vertex?

**Summary:**

Please help! If the telescope is 9 m deep and 12 m wide, the focus is 3.375 m far from the vertex.

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