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(80.) x=0°, 30°, 90°, 150°, 180°, (24.) 55.74 ft.

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(81.) x=0°, 45°, 120°, 240°, 225°,| (26.) 556.34 ft.

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(89.) x=0°, 90°, 120°, 180°, 240°, (35.) 45.183 ft.

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d=137° 40′ 43". (4.) C=65° 49′ 54′′, α = = 63° 10′ 6′′, b=38° 59′ 12′′. (5.) a=75° 13' 1", B= 58° 25′ 46′′, C=67° 27' 1". (6.) a = 76° 30' 37", b=65° 28′ 58," c = 55° 47′ 44′′. (7.) B= 54° 44′ 23′′, b=64° 36′ 39′′, c = 47° 57′ 45′′. (8.) B=96° 13′ 23′′, a=73° 17′ 29′′, c=70° 8′ 38′′.

(9.) B=66° 58′,

a = 11° 35′ 49′′, c=4° 35' 26". (10.) α=61° 4′ 55′′, b=40° 30′ 22′′, c = 50° 30' 32".

§ 99 (page 107). (1.) 155° 35′ 22",

B=10° 19′ 34′′, C=171° 48′ 22′′. (2.) a = 131° 36′ 36′′, b=116° 36′ 58′′, c = 29° 11′ 42′′. (3.) a = 107° 7′ 45′′, B=48° 57' 29", C=62° 31′ 40′′. (4.) B=62° 54′ 43′′, a=114° 30' 26", c = 56° 39′ 10".

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§ 100 (page 10g).

(1.) 80.895 sq. in.
(2.) 26.869 sq. in.
(3) 158.41 sq. in.
(4.) 39533 sq. miles.

§ 101 (page 112). (1.) SC48° 2' 43", AC=52° 53′ 9′′.

(2.) 7:24 A.M. (3.) 4 P.M.

§ 102 (page 114). miles.

(1.) 3029

(2.) 2229.8 miles.

(3) 2748.5 miles.

(4.) 7516.3 miles.

(5.) 5109 miles.

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