jika kita lihat di gambar tersebut
di tengah tersebut terdapat segitiga
di mana jumlah sudut segitiganya adalah 180°
maka
K+L+M = 180°
lalu
(a+b+c) + K = 360°
a+b+c = 360° - K
(e+f+g) + L = 360°
e+f+g = 360° - L
(h+i+j) + M = 360°
h+i+j = 360° - M
(a+b+c) + (e+f+g) + (h+i+j)
=(360°-K) + (360°-L) + (360°-M)
= 360°-K + 360°-L + 360°-M
= 1080° -K -L -M
= 1080° - (K+L+M)
= 1080° - (180°)
= 1080° -180°
= 900°
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jika kita lihat di gambar tersebut
di tengah tersebut terdapat segitiga
di mana jumlah sudut segitiganya adalah 180°
maka
K+L+M = 180°
lalu
(a+b+c) + K = 360°
a+b+c = 360° - K
(e+f+g) + L = 360°
e+f+g = 360° - L
(h+i+j) + M = 360°
h+i+j = 360° - M
maka
(a+b+c) + (e+f+g) + (h+i+j)
=(360°-K) + (360°-L) + (360°-M)
= 360°-K + 360°-L + 360°-M
= 1080° -K -L -M
= 1080° - (K+L+M)
= 1080° - (180°)
= 1080° -180°
= 900°