# Two poles of height 6m and 11m stands on a plane ground, if the distance between their feet is 12m. Find the distance between their tops.

The Pythagoras theorem states that if a triangle is right-angled (90 degrees), then the square of the hypotenuse is equal to the sum of the squares of the other two sides.

## Answer: Two poles of height 6m and 11m stands on a plane ground, where distance between their feet is 12m, so the distance between the top of the two poles is 13 m.

The Pythagoras theorem works only for right-angled triangles. When any two values are known, we can apply the theorem and calculate the third side.

**Explanation:**

Let's draw the diagram of the two poles AB and CD as shown:

Let, BD be the distance between the top of the two poles.

Assume, BD = x meters

As △BED is a right-angled triangle, right angled at E, therefore 'x' is the hypotenuse.

Now apply the Pythagoras theorem on △BED ,

**Hypotenuse ^{2} = Perpendicular^{2} + Base^{2}**

⇒ BD^{2} = ED^{2} + BE^{2}

⇒ x^{2} = 12^{2} + 5^{2 }

⇒ x^{2} = 144 + 25^{ }

⇒ x^{2} = 169

⇒ x = 13 m