You have to get X all by itself so you divide 20 and 30 which gives you a fraction. X= 20/30
Then = 2/3
If you look at the line it never stops. Y can be any number and X can be any number so X and y are elements of reels meaning your answer is a
3 sides of square is 3*12=36 cm
perimeter for the full circle is 2 * pi * radius
which is =2 * 22/7 * 12 =75.43 cm
so 360° =75.43 cm
for 150° = 75.43/360 *150 =31.43
all together =36 +31.43 =67.43 cm
Please see attached image for the correct answer