Question:medium

The coordinates of the three vertices of a triangle are: (1, 2), (7, 2), and (1, 10). Then the radius of the incircle of the triangle is

Updated On: Jan 13, 2026
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Correct Answer: 2

Solution and Explanation

The given triangle is a right-angled triangle with sides measuring 6, 8, and 10 units.

For a right triangle, the inradius \( r \) can be calculated using the formula:

\[ r = \frac{a + b - c}{2} \] where \( a \) and \( b \) are the lengths of the legs, and \( c \) is the length of the hypotenuse.

Plugging in the values \( a = 6 \), \( b = 8 \), and \( c = 10 \):

\[ r = \frac{6 + 8 - 10}{2} = \frac{4}{2} = 2 \]

The inradius is therefore 2 units.

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