1-15. The area of a square plot of land 21.34 ch. by 17.89 ch. isa. 381.774 ac.b. 381.761 ac.c. 38.176 ac.d. 38.177 ac.1-16. Convert 32,567.78 Standard Feet to U.S. Survey feet.a. 32,567.45 ft.b. 32,567.95 ft.c. 32,568.71 ft.d. 32,568.53 ft.1-17. 21.61892 grads converted to D/M/S equalsa. 19° 27' 25"b. 24° 01' 16"c. 24° 02' 10"d. 19° 27' 44"1-18. Round oft 21° 36' 24.6" to the nearest second. a. 21° 36' 25"b. 21° 36' 24"c. 21. 36' 23"d. 21° 36' 26"1-19. Round off 3.49562 acres to 3 decimal places. a. 3.497 acresb. 3.496 acresc. 3.495 acresd. 3.494 acres1-20. Round off 1,724.6753 ft to 2 decimal places. a. 1,724.67 ftb. 1,724.66 ftc. 1,724.69 ftd. 1,724.68 ft