In order to organise Annual Sports day a school prepared

Case Study question maths class 10

Case Study 3:- In order to organise Annual Sports day a school prepared an eight lane running track with an integrated football field inside the track area as shown below :

The length of innermost lane of the track is 400 m and each subsequent lane is 7.6 m longer than the preceding lane. [CBSE 2025]

Based on given information, answer the following questions, using concept on Arithmetic Progression.

(i) What is the length of the $6^{th}$ lane ? (1)

(ii) How long is the $8^{th}$ lane than that of $4^{th}$ lane ? (1)

(iii) (a) While practicing for a race, a student took one round each in first six lanes. Find the total distance covered by the student. (2)

(iii) (b) A student took one round each in lane 4 to 8. Find the total distance covered by the student. (2)

Solution:- The length of innermost lane of the track is 400 m

And each subsequent lane is 7.6 m longer than the preceding lane.

Now the A. P.

400, 407.6, 415.2 . . .

First term of A.P. (a) = 400

d = 7.6

(i) Legth of 6th lane, n = 6

$a_n = a + (n-1)d$

⇒ $a_6 = 400 + (6-1)(7.6)$

⇒ $a_6 = 400 + 38 = 438$

(ii) Legth of 8th lane, n = 8

$a_n = a + (n-1)d$

⇒ $a_8 = 400 + (8-1)(7.6)$

⇒ $a_8 = 400 + 53.2 = 453.2$

and

Legth of 4th lane, n = 4

$a_n = a + (n-1)d$

⇒ $a_4 = 400 + (4-1)(7.6)$

⇒ $a_8 = 400 + 22.8 = 422.8$

$a_8 - a_4 = 453.2 - 422.8 = 30.4$ m

(iii) (a) While practicing for a race, a student took one round each in first six lanes

$S_6 = \dfrac{n}{2}[2a + (n - 1)d]$

⇒ $S_6 = \dfrac{6}{2}[2(400) + (6 - 1)(7.6)]$

⇒ $S_6 = (3)[800 + 38]$

⇒ $S_6 = (3)[838]$

⇒ $S_6 = 2514$ m

Total distance from one round each in first six lanes = 2514 m

(iii) (b) A student took one round each in lane 4 to 8

$S_3 = \dfrac{n}{2}[2a + (n - 1)d]$

⇒ $S_3 = \dfrac{3}{2}[2(400) + (3 - 1)(7.6)]$

⇒ $S_3 = (1.5)[800 + 15.2]$

⇒ $S_3 = (1.5)[815.2]$

⇒ $S_3 = 1222.8$ m

and

$S_8 = \dfrac{n}{2}[2a + (n - 1)d]$

⇒ $S_8 = \dfrac{8}{2}[2(400) + (8 - 1)(7.6)]$

⇒ $S_8 = (4)[800 + 53.2]$

⇒ $S_8 = (4)[853.2]$

⇒ $S_8 = 3412.8$ m

the total distance covered by the student from 4 to 8 lane

= $S_8 - S_3$

= 3412.8 – 1222.8 = 2190 m

Case Study 1:- The Statue of Unity situated in Gujarat is the world’s largest Statue which stands over a 58 m high base. As part of the project, a student constructed an inclinometer and wishes to find the height of Statue of Unity using it. [ CBSE 2025]

He noted following observations from places :

Situation – I :

The angle of elevation of the top of Statue from Place A which is 80√3 m away from the base of the Statue is found to be 60º.

Situation – II :

The angle of elevation of the top of Statue from a Place B which is 40 m above the ground is found to be 30º and entire height of the Statue including the base is found to be 240 m.

Based on given information, answer the following questions :

(i) Represent the Situation – I with the help of a diagram. (1)

(ii) Represent the Situation -II with the help of a diagram. (1)

(iii) (a) Calculate the height of Statue excluding the base and also find the height including the base with the help of Situation -I. (2)

(iii) (b) Find the horizontal distance of point B (Situation – II) from the Statue and the value of $\tan \alpha$ , where α is the angle of elevation of top of base of the Statue from point B. (2)

Solution:- See full solution

Case Study 2:- Anurag purchased a farmhouse which is in the form of a semicircle of diameter 70 m. He divides it into three parts by taking a point P on the semicircle in such a way that ∠PAB = 30º as shown in the following figure, where O is the centre of semicircle.

In part I, he planted saplings of Mango tree, in part II, he grew tomatoes and in part III, he grew oranges.

[CBSE 2025]

Based on given information, answer the following questions.

(i) What is the measure of ∠POA ? (1)

(ii) Find the length of wire needed to fence entire piece of land. (1)

(iii) (a) Find the area of region in which saplings of Mango tree are planted. (2)

(iii) (b) Find the length of wire neede to fence the region III. (2)

Solution:- See full solution

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