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APB + AQB + ARB = 84. Sudut keliling yg menghadap busur yg sama itu besarnya sama. Jadi APB = AQB = ARB (bukan Aburizal Bakrie)
yaudah APB + AQB + ARB = 84
3x = 84
x = 28
sudut pusat = 2 x sudut keliling
= 2 x 28 = 56 (opsi C)
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No. 27
3x + 3y = 180
sudut dalam segi empat = 360
360 = 3x + 4y + x + 20 + 3x
360 = 4x + 4y + 20 + 3x
340 = 7x + 4y
stuck di sini, maaf hehe