Question
Find the value of x.
- 12√2
- 2√12
- 24
- 2
Hint:
We are given a right-angled triangle. It is a 45°-45°-90° triangle. We are given the length of one of it’s leg. We are asked to find the value of the hypotenuse. We have to use the properties of both right-angled triangle and 45°-45°-90° triangle.
The correct answer is: 12√2
Let the given triangle be ABC
∠ABC = 90°
AB = 12
AC =x
It is a 45°-45°-90° triangle. The two angles of the triangle are same. It means the sides opposite to the triangle are equal. When a triangle has two sides equal, it is an isosceles triangle.
The given triangle is an isosceles triangle.
AB = BC
So, BC = 12
Now, we will use the Pythagoras theorem. It states that, the square of the hypotenuse is equal to the sum of the square of the two sides.
AC2 = AB2+ BC2
= (12)2 + (12)2
x2 = 2(12)2
Taking square root we get,
x = 12√2
Therefore, the value of the hypotenuse is 12√2.
For such questions, we should know the properties of right-angled triangle.
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