RS Aggarwal & V Aggarwal - Mathematics

Book: RS Aggarwal & V Aggarwal - Mathematics

Chapter: 7. Areas

Subject: Mathematics - Class 9th

Q. No. 11 of CCE Questions

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11

The lengths of the three sides of the triangle are 30 cm, 24 cm and 18 cm respectively. The length of the altitude of the triangle corresponding to the smallest side is-

It is given in the question that,

Sides of the triangle = 30 cm, 24 cm and 18 cm


Let h be the altitude of the triangle


Semi-perimeter =


=


= 36 cm


Now, Area of triangle =


=


=


= 216 cm2


Also, Area =


216 =


216 = 9 × h


h =


= 24 cm


Hence, option (a) is correct

11

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