pada jajargenjang KLMN , besar sudut K = ( ×+5) dan Sudut N = ( 3×-25) .tentukan besar sudut L?

<k + <N = 180
x +5 + 3x - 25 = 180
4x - 20 = 180
4x = 200
x = 50

<L = <N = 3x - 25
<L = 3(50) - 25
<L = 150 - 25
<L = 125

Jajargenjang KLMN
<K = <M
<K + <N = 180° ( sudut yang berdekatan = 180°)
<L = <N

( x + 5 ) + ( 3x - 25 ) = 180°
4x - 20 = 180°
4x = 180° + 20°
4x = 200°
x= 200/4 = 50°

Sudut L = sudut N
<N = 3( 50) - 25° = 150° - 25° = 125°
Besar < L = 125°