a2 b2tC2 b2 B c2 Examples · 2020. 2. 19. · a2 b2 SAS 25.325 A b2tC2 2bcCOSX aZtc2 2ac COSB c2...
Transcript of a2 b2tC2 b2 B c2 Examples · 2020. 2. 19. · a2 b2 SAS 25.325 A b2tC2 2bcCOSX aZtc2 2ac COSB c2...
a2 b2tC2 2bcCOSXb2 aZtc2 2ac COS Bc2 a2tb2 Lab COSTY
When to use the law of cosinesSASSSS
ExamplesTriangle ABC given 13 980 a 13 C 20
B SASGr
20 980 13 b2 202 132 2113 20 cos 98
AMA 25.325 C Fbk641.370MA 2 3 b 25.325 the law of sines180 98 30.553 51.4470 will not work if
b 2 siAf sn98 you are trying13 25.325 to find the
98 251251nA Obtuse Angle25.325 25.3
SintinA _gin 1135in25.325
A 30.5530
given Triangle Abc where a 30 b 20 C 15
B AZ b'to 2 bc COSA
15 30 302 202 152 2120 15 COSA
ABB 20 c 7,0522 202 152
in 8 Since 312 202 152 2.20 15 cos A15 2.20.15 2.20
since 155in117.28To A cog
302 202 15226.384 2.20.15
36.336LA H7.2
Area of triangles
5AS SSS
Area _YzbcsinA Area _NEEDKacsinB 5 Semi Perimeter _atb
tab since 2
pting's'oheaatawgivene taindutheb.fiiIenAreaYz 2oXl8 sin75S 6t8tl2173.87 unitz 2 13
A T1343 6743 8 13 1221.33