Jawaban:

a. 123°15'20" + 27°51'55"

= (123° + 27°)(15' + 51')(20" + 55")

= 150°66'75"

sederhanakan

150°66'75"

= 150° + (60' + 6')(60" + 15")

= 150° + 1° + 6' + 1' + 15"

= 151°7'15"

b. 157°35'42" + 127°49'35"

= (157° + 127°)(35' + 49')(42" + 35")

= 284°84'77"

sederhanakan

284°84'77"

= 284° + (60' + 24')(60" + 17")

= 284° + 1° + 24' + 1' + 17"

= 285°25'17"

c. 320°5'30" - 217°21'45"

= 319°64'90" - 217°21'45"

= (319° - 217°)(64' - 21')(90" - 45")

= 102°43'45"

d. 230°15'12" - 135°45'52" + 23°34'52

= 229°74'72" - 135°45'52" + 23°34'52

= (229° - 135° + 23°)(74' - 45' + 34')(72" - 52" + 52)

= 117°63'72"

sederhanakan

117°63'72"

= 117° + (60' + 3')(60" + 12")

= 117° + 1° + 3' + 1' + 12"

= 118°4'12"

note:

1° = 60'

1' = 60"

jadi jika angka yang bertanda (') dan (") lebih dari 60, maka sederhanakanlah.

semoga membantu ya gess :)