besar sudut y berapa ya?
y= (x-5)+(2x-5)
spertinya ada hubungan dengan busur (7x-90)
y= (x-5)+(2x-5)
spertinya ada hubungan dengan busur (7x-90)
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LINGKARAN
SUDUT KELILING
(2x - 5)° + (x - 5)° = y
3x - 10° = 7x - 90°
7x - 3x = 90° - 10°
4x = 80°
x = 80°/4
x = 20°
Besar sudut y
= 7x - 90°
= 7(20°) - 90°
= 140° - 90°
= 50°