a. 60 derajat
b. 65 derajat
c. 70 derajat
d. 80 derajat
- Nilai x
4x - 5° = 180° - (3x + 30°) + 55°
4x - 5° = 180° - 3x - 30° + 55°
4x + 3x = 180° - 30° + 55° + 5°
7x = 210°
x = 30°
- Besar sudut ABC
= 180° - (4x - 5°)
= 180° - (4(30°) - 5°)
= 180° - (120° - 5°)
= 180° - 115°
= 65° (B.)
[tex] \pink{\boxed{\red{\boxed{\purple{\mathfrak{\ast ~ \blue{Celia ~ Claire} ~ \ast}}}}}}[/tex]
Menentukan Nilai X Nya Terlebih Dahulu ^^
( 4x - 5 ) + ( 3x + 30 ) = 180° + 55°
4x + 3x - 5 + 30 = 235°
7x + 25° = 235°
7x = 235° - 25°
7x = 210
x = 210/7
x = 30°
____________________
Menentukan Sudut ABC
Sudut ABC + ( 4x + 5 ) = 180°
Sudut ABC = 180 - ( 4x - 5 )
Sudut ABC = 180 - ( 4(30) - 5 )
Sudut ABC = 180 - ( 120 - 5 )
Sudut ABC = 180 - ( 115 )
Sudut ABC = 65° ( B )
[tex]\purple{\boxed{\green{\boxed{\red{\tt{\ \: \red{{ ༻ シ︎XxDAЯКNESSxXツ ༺ }}}}}}}}[/tex]
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