Question

In case of right angled triangles, Identity the right angles.
5. A 15 m long ladder reaches a window 12 m high from the ground on placing it
against a wall. How far is the foot of the ladder from the wall?
ind the area and the nerimeter of the rectangle whose length is 15 cm and the​

Answer 1

Answer:

ladder is 15m long and the wall is 12m long.

The length of ladder is hypotenuse and the height of wall is height of a right angle triangle.

Now, By using pythagoras theoram.

15

${15}^{2} = {12}^{2} + {b}^{2}$

now,

${b}^{2} = {15}^{2} - {12}^{2}$

${b}^{2} = 225 - 144$

${b}^{2} = 81$

$b = \sqrt{81}$

$b = 9$

The foot of the ladder from the wall is 9m long.

Answer 2

Answer:

11m

Step-by-step explanation:

If we draw this structure, we will find a right angled triangle

In figure one can see that distance is a base of a triangle

So we can say that,

Ladder is a hypotenuse of triangle whereas wall is a height of a triangle

According to Pythagoras theorem,

We can say,

(15m)²=(12m)²+ (xm)²

(xm)²=(15m)²- (12m)²

xm=root 225m²-144m²

xm=root 121m²

xm=11m ans.

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