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