Chapter 1.6, Problem 7CYU

To determine

To calculate area and perimeter.

Answer to Problem 7CYU

Circumference is 80cm.

  Area of triangle is 520cm square

Explanation of Solution

Given information:

  

Formula used:

  Perimeter of circle is,

  $circumference=2\pi r$

  Area of circle,

  $area=\pi r^2$

Calculation:

For the circumference, substituting the values,

  $circumference=2\times 3.14\times 12.8$

On solving,

  $circumference=80.384$

Rounding off,

  $circumference=80$

Hence, circumference is 80cm.

For the area, substituting the value,

  $area=3.14\times {(12.8)}^2$

On solving,

  $area=514.45$

Rounding off,

  $area=520$

Hence, area of circle is 520cm square