jika kita lihat di gambar
di tengah tersebut terdapat segitiga
dimana jumlah ketiga sudutnya sama dengan 180°
maka
g+h+k = 180°
lalu
x+k = 180°
x= 180°-k
y+g = 180°
y = 180°-g
z+h = 180°
z = 180°-h
x+y+z
=(180°-k)+(180°-g)+(180°-h)
=180°-k+180°-g+180°-h
=540° -k-g-h
= 540 -(k+g+h)
=540°-(g+h+k)
=540°-(180°)
=540°-180°
= 360°
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jika kita lihat di gambar
di tengah tersebut terdapat segitiga
dimana jumlah ketiga sudutnya sama dengan 180°
maka
g+h+k = 180°
lalu
x+k = 180°
x= 180°-k
y+g = 180°
y = 180°-g
z+h = 180°
z = 180°-h
x+y+z
=(180°-k)+(180°-g)+(180°-h)
=180°-k+180°-g+180°-h
=540° -k-g-h
= 540 -(k+g+h)
=540°-(g+h+k)
=540°-(180°)
=540°-180°
= 360°