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x= 180°-50°-50°= c.80°
29) ....
<A : <B = 2 : 3
<A = <C
<B = <D
jumlah sudut belah ketupat = 360
360 = <A + <B + <C + <D = 2x + 3x + 2x + 3× = 10x
x = 360/10 = 36°
<C = 2x = 2 × 36 = c. 72°
maaf kalau salah hehe...