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Q.

Find the area of a right-angled triangle if the radius of its circumcircle is 2.5 cm and the altitude drawn to the hypotenuse is 2 cm long.


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a

5 cm 2  

b

11 cm 2  

c

17 cm 2  

d

9 cm 2   

answer is A.

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Detailed Solution

Given that the radius of a circumference of right triangle and altitude drawn to the hypotenuse are given as Question Imagecm and Question Imagecm.
We have to find the area of the right-angled triangle.
The expression to find the area of a triangle is A= 1 2 b h   .Here b and h are the base and height of a triangle.
The required figure geometry is shown below,
Question ImageIn the right triangle, the hypotenuse is the diameter of the circumcircle and its center is the mid-point of the hypotenuse. So,
Question Image Then, the area, A of a triangle ACB is,  Question ImageThe area is 5  cm 2  .
Therefore, the correct option is 1.
 
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