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The area of a triangle is 72 cm² and its perimeter is 8 cm. Find the radius of the inscribed circle.
  1. 9 cm
  2. 18 cm
  3. 24 cm
  4. 36 cm
Explanation

Formula: Area = r × s

Semi-perimeter: s = Perimeter ÷ 2 = 8 ÷ 2 = 4 cm

Therefore: r = Area ÷ s = 72 ÷ 4

= 18 cm

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The area of a triangle is 72 cm² and its perimeter is 8 cm. Find the radius of the inscribed circle.
  1. 9 cm
  2. 18 cm
  3. 24 cm
  4. 36 cm
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