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OA = 21 cm
AB = 7 cm
pnjng busur lingkaran kecil
= 45/360 . 2. 22/7 . 21
=1/8 . 132=16,5 cm
pnjng busur lingkaran besar
= 45/360. 2. 22/7. 28
= 1/8 . 176 =22 cm
keliling = 16,5 + 7+ 22+ 7 = 52,5 cm
5. 3x+y= -10 x3 = 9x+3y=-30
2x+3y=-16. x1 = 2x+3y= -16
------------ -
7x. = -14
x = -14/7 = -2
2.-2 +3y=-16
-4 + 3y = -16
3y = -16 +4 = -12
y = -12/3 = -4
3x - y = 3.-2 -(-4) = -6 + 4 = -2