Answer:
x^2+y^2=r^2 is quation of circle whose centre is (0,0)
Isnt it 15?? since theyre all suppose to be the samw
To solve for this, set up a proportion.
21/40 = x/100.
Cross multiply the fraction's numerators with the denominators;
21 x 100, 40 and x.
2100/40x.
Divide both numbers by 40 to get x.
2100/40 = 52.5
21 is 52.5% of 40.
I hope this helps!
