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Mathematics

Statement 1: Area of given triangle ABC = 6 x 5 cm2.

Area of given triangle ABC = 6 x 5 cm2, Area of given triangle ABC = 1/2 x 6 x 4 cm2. Pythagoras Theorem, Concise Mathematics Solutions ICSE Class 9.

Statement 2: Area of given triangle ABC = 12\dfrac{1}{2} x 6 x 4 cm2.

Area of given triangle ABC = 6 x 5 cm2, Area of given triangle ABC = 1/2 x 6 x 4 cm2. Pythagoras Theorem, Concise Mathematics Solutions ICSE Class 9.
  1. Both the statements are true.

  2. Both the statements are false.

  3. Statement 1 is true, and statement 2 is false.

  4. Statement 1 is false, and statement 2 is true.

Pythagoras Theorem

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Answer

Draw a perpendicular bisector, AD.

The perpendicular bisector of the base also passes through the midpoint of the base, effectively dividing it into two equal segments.

BD = DC = 62\dfrac{6}{2} = 3 cm

According to Pythagoras theorem, in a right-angled triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides.

⇒ Hypotenuse2 = Base2 + Height2

In Δ ABD,

⇒ AB2 = AD2 + BD2

⇒ 52 = AD2 + 32

⇒ 25 = AD2 + 9

⇒ AD2 = 25 - 9

⇒ AD2 = 16

⇒ AD = 16\sqrt{16}

⇒ AD = 4 cm.

Using formula, area of triangle = 12\dfrac{1}{2} x base x height

Here, base, BC = 6 cm and height, AD = 4 cm

⇒ Area of triangle = 12\dfrac{1}{2} x 6 x 4 cm2

∴ Statement 1 is false, and statement 2 is true.

Hence, option 4 is the correct option.

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