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Prob. 1-1
(a) c=√10 +72=12.21 ft
(b) b√202-16 = 12.00 m
Prob. 1-2
(a) a 25 sin 48° = 18.58 ft
(b) b√252-18.582 = 16.73 ft (c) hb sin 48°16.73 sin 48°= 12.43 ft
Prob. 1-3 a=√722-67.3225.59 ft Acos (67.3/72)=20.8° Bsin (67.3/72) 69.2°
Prob. 1-4.
A
WALL 2
70%
B
AB-28 sin70° = 26.3 ft
Prob. 1-5.
10
c62+10211.6 ft 0tan (6/10) 31.0°
Prob. 1-6
sin (5/6) 56.4° x=122+102 6.63 ft
Prob. 1-8
2
28
Rx+2+3 cos 45° +06 sin 45° =-0.1213 mi R0-3 sin 45°+6-6 sin 45° --0.364 mi.
R(-0.1213)2+(-0.364)² = 0.384 mi.
Prob. 1-9
مار
A
(a) 112+132-2(11)(13)cos80° -15.50 ft sin 80° sin A sinB 15.50 11 13 A=44.3°, B=55.7° B
80
13'
C
B
185
(b) a782+852-2(78)(85) cos 72° = 96,0 ft sin 72 sin C sin B a 85 78 C-57.4°, B50.6°
720
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