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NDA 2025
Exam
NDA
Year
2025
Subject
Mathematics
Chapter
Area Under Curves

NDA 2025 · Mathematics · Area Under Curves

Consider the following for the two (02) items that follow: Let the...

Consider the following for the two (02) items that follow:
Let the curve f(x)=∣x−3∣f(x) = |x - 3|.

What is the area bounded by the curve f(x)f(x) and y=3y = 3?

Options

  1. A33 square units
  2. B4.54.5 square units
  3. C7.57.5 square units
  4. D99 square units

Correct answer

D. 99 square units

Step-by-step solution

The given curve is y=∣x−3∣y = |x - 3| and the line is y=3y = 3.

To find the points of intersection, we equate the two equations:

∣x−3∣=3|x - 3| = 3

x−3=3x - 3 = 3 or x−3=−3x - 3 = -3

x=6x = 6 or x=0x = 0

The points of intersection are (0,3)(0,3) and (6,3)(6,3). The vertex of the curve y=∣x−3∣y = |x - 3| is at (3,0)(3,0).

The area bounded by the curve and the line forms a triangle with vertices (0,3)(0,3), (6,3)(6,3), and (3,0)(3,0).

The length of the base of this triangle (along the line y=3y = 3) is 6−0=66 - 0 = 6 units.

The height of the triangle (perpendicular distance from the vertex to the base) is 3−0=33 - 0 = 3 units.

The required area is given by:

Area =12×base×height= \dfrac{1}{2} \times \text{base} \times \text{height}

Area =12×6×3=9= \dfrac{1}{2} \times 6 \times 3 = 9 square units.

Answer: 99 square units
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