Mathematics · Area under the Curves

JEE Main 2025 — 23 January, Morning Shift — Question 21

If the area of the larger portion bounded between the curves x2+y2=25x^{2}+y^{2}=25 and y=∣x−1∣y=|x-1| is 14(bπ+c)\frac{1}{4}(b \pi+c), b,c∈N\mathrm{b}, \mathrm{c} \in \mathbb{N}, then b+c\mathrm{b}+\mathrm{c} is equal to _____\_\_\_\_\_

Answer: 77

Numerical answer — enter this value.

Step-by-step solution

x2+y2=5x^{2}+y^{2}=5

x2+(x−1)2=25⇒x=4,−3\mathrm{x}^{2}+(\mathrm{x}-1)^{2}=25 \Rightarrow \mathrm{x}=4,-3

A=25π−∫−3425−x2dx+12×4×4+12×3×3A=25 \pi-\int_{-3}^{4} \sqrt{25-x^{2}} d x+\frac{1}{2} \times 4 \times 4+\frac{1}{2} \times 3 \times 3

A=25π+252−[x225−x2+252sin⁡−1x5]−34\mathrm{A}=25 \pi+\frac{25}{2}-\left[\frac{\mathrm{x}}{2} \sqrt{25-\mathrm{x}^{2}}+\frac{25}{2} \sin ^{-1} \frac{\mathrm{x}}{5}\right]_{-3}^{4}

A=25π+252−[6+252sin⁡−145+6+252sin⁡−135]\mathrm{A}=25 \pi+\frac{25}{2}-\left[6+\frac{25}{2} \sin ^{-1} \frac{4}{5}+6+\frac{25}{2} \sin ^{-1} \frac{3}{5}\right]

A=25π+12−252⋅π2\mathrm{A}=25 \pi+\frac{1}{2}-\frac{25}{2} \cdot \frac{\pi}{2}

A=75π4+12\mathrm{A}=\frac{75 \pi}{4}+\frac{1}{2}

A=14(75π+2)\mathrm{A}=\frac{1}{4}(75 \pi+2)

b=75,c=2\mathrm{b}=75, \mathrm{c}=2

b+c=75+2=77\mathrm{b}+\mathrm{c}=75+2=77

Solution figure

Answer key and solution verified before publishing.

Practise Area under the Curves

Start with this question, then two more from the same chapter — with a tutor that explains every step. Free.

Exam
JEE Main 2025
Subject
Mathematics
Chapter
Area under the Curves
Topic
Area under the Curves