Multiple choice

The area of a triangle is 80 cm2 and its perimeter is 8 cm. The radius of its inscribed circle is

  1. 10 cm

  2. 20 cm

  3. 5 cm

  4. none of these
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B Correct answer
AI explanation

Using the area of a triangle formula involving the inradius, Area is equal to half of the perimeter multiplied by the radius. Substituting the given values, 80 equals half of 8 multiplied by r, which simplifies to 80 equals 4r. Solving for r gives 20 cm.

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