Question

If the circumference of a circle is reduced by 50%, then the area of the circle will reduce by

Answer 1

Answer: 75%

Step-by-step explanation:

If circumference is reduced by 50%, radius is reduced by 50% .

If r is the initial radius , new radius is r/2.

Initial area A is pi r^2 . New area is pi r^2/4

= 25% of initial area.

Thus there is a reduction of 75% area

Answer 2

Step-by-step explanation:

$2\pi r \times 1\div 2 = r \div 2$

then, 22÷7×r÷2×r÷2=11÷14r^2