Question

Besar sudut-sudut sebuah segitiga adalah 2x°, )3x-5)° , dan (4x+14)° .Besar sudut masing-masing adalah...

Answer 1

180 = 2x + 3x - 5 + 4x + 14
180 = 9x + 9
  9x = 171
    x = 19

2x° = 38°
( 3x - 5 )° = 52°
( 4x + 14 )° = 90°

Answer 2

180 = <A + <B + <C
180 = 2x + 3x + -5 + 4x + 14
180 = 9x + 9
180-9 = 9x
171 = 9x
171 : 9 = x
19 = x

<A = 2x = 2  x  19 = 38
<B = 3x - 5 = (3 x 19) - 5 = 57-5 = 52
<C = 4x + 14 = (4 x 19) + 14 = 76 + 14 = 90