NCERT Class 10 Mathematics

ANSWERS/HINTS 357

5. 40 3 m 6.19 3 m 7.^20 ^3 ✂1 m✁ 8. 0.831m✄ ✆ ☎


6. 16 m^2
   3
   10. 20 3m,20m,60m 11. 10 3 m, 10 m 12. 731m✝ ✟ ✞


7. 50 3 m 14.

(^294) 3m
5 15. 3 seconds
EXERCISE 10.1

1. Infinitely many


2. (i) One (ii) Secant (iii) Two (iv) Point of contact 3.D

EXERCISE 10.2

1. A 2.B 3. A 6.3 cm


2. 8 cm 12.AB = 15 cm, AC = 13 cm

EXERCISE 12.1

1. 28 cm 2.10 cm


2. Gold : 346.5 cm^2 ; Red : 1039.5 cm^2 ; Blue : 1732.5 cm^2 ; Black : 2425.5 cm^2 ; White : 3118.5 cm^2.


3. 4375 5.A

EXERCISE 12.2

1.^132 cm^2
7
2.^77 cm^2
8

3.^2

154

cm

3

4. (i) 28.5 cm^2 (ii) 235.5 cm^2


5. (i) 22 cm (ii) 231 cm^2 (iii)^2

441 3

231 cm

4

✠ ✡

☞☞ ☛ ✌✌

✍ ✎

6. 20.4375 cm^2 ; 686.0625 cm^2 7. 88.44 cm^2


7. (i) 19.625 m^2 (ii) 58.875 cm^2 9.(i) 285 mm (ii)^2

385

mm

4

10.^2

(^22275) cm
28 11.
(^158125) cm 2
126
12.189.97 km^2

13. Rs 162.68 14.D