Suatu segitiga dengan sudut sudut 4x° ,(3x+1) °,dan (2x-1) °,maka nilai (2x-5) adalah... A.20° B.25° C.30° D.35° E.45°

4x + (3x + 1) + (2x - 1) = 180.
9x = 180 - 1 + 1.
9x = 180.
x = 180/9.
x = 20.

= 2x - 5.
= 2(20) - 5.
= 40 - 5.
= 35.

Jawaban : D.

Sudut dlm segitiga adl 180°

4x° + (3x + 1)° + (2x - 1)° = 180
4x + 3x + 2x + 1 - 1 = 180
9x = 180
x = 180/9
x = 20°

Nilai (2x - 5)
= 2x - 5
= 2 (20) - 5
= 40 - 5
= 35° (Opsi D)