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Mathematics

ABC is a triangle with AB = AC = 12 cm and ∠A = 90°, the area of the triangle ABC is :

  1. 144 cm2

  2. 36 cm2

  3. 72 cm2

  4. 108 cm2

Mensuration

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Answer

Given:

AB = AC = 12 cm

∠A = 90°

ABC is a triangle with AB = AC = 12 cm and ∠A = 90°, the area of the triangle ABC is : Area and Perimeter of Plane Figures, Concise Mathematics Solutions ICSE Class 9.

Area of triangle = 12\dfrac{1}{2} x base x altitude

= 12\dfrac{1}{2} x 12 x 12 cm2

= 12\dfrac{1}{2} x 144 cm2

= 72 cm2

Hence, option 3 is the correct option.

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