Multiple choice

The radius of a circle is 20% more than the height of a right angled triangle. The base of triangle is 36 cm. If the area of triangle and circle be equal, what will be the area of circle? (Approx.)

  1. 72 cm2.

  2. 144 cm2.

  3. 216 cm2.

  4. 128 cm2.

  5. 77 cm2.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Triangle area = 1/2 × 36 × h = 18h. Circle area = π(1.2h)² = 1.44πh². Equating: 18h = 1.44πh², so h ≈ 3.98 cm. Circle area = 1.44π(3.98)² ≈ 72 cm². Option A is correct.

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