a2 b2tc2 b2 b c2 examples · 2020. 2. 19. · a2 b2 sas 25.325 a b2tc2 2bccosx aztc2 2ac cosb c2...

2

a2 b2tC2 2bcCOSX b2 aZtc2 2ac COS B c2 a2tb2 Lab COSTY When to use the law of cosines SAS SSS Examples Triangle ABC given 13 980 a 13 C 20 B SAS Gr 20 980 13 b 2 202 132 2113 20 cos 98 AMA 25.325 C Fbk 641.370M A 2 3 b 25.325 the law of sines 180 98 30.553 51.4470 will not work if b 2 siAf sn98 you are trying 13 25.325 to find the 98 251251nA Obtuse Angle 25.325 25.3 SintinA _gin 1135in 25.325 A 30.5530

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Page 1: a2 b2tC2 b2 B c2 Examples · 2020. 2. 19. · a2 b2 SAS 25.325 A b2tC2 2bcCOSX aZtc2 2ac COSB c2 a2tb2 Lab COSTY When to use the law of cosines SAS SSS Examples Triangle ABC given

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

Page 2: a2 b2tC2 b2 B c2 Examples · 2020. 2. 19. · a2 b2 SAS 25.325 A b2tC2 2bcCOSX aZtc2 2ac COSB c2 a2tb2 Lab COSTY When to use the law of cosines SAS SSS Examples Triangle ABC given

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

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