Question

Perimeter, Area And Volume

Answer 1

Answer:

A ≈ 1900.7 m²

Step-by-step explanation:

The area (A) of the race track is

area of outer circle - area of inner circle

= πR² - πr²

= π × 63² - π × 58²

= π (63² - 58² )

= π(3969 - 3364)

= π × 605

≈ 1900.7 m² ( to 1 dec. place )

Answer 2

Answer:

A = 19.663 m^2  Bigger perimeter =395.841 m Smaller perimeter = 364.425m

Step-by-step explanation:

To get the area you take the bigger circle minus the smaller circle

A = ( π × R^2) - (π × r^2)

Then just plug stuff in

A = ( π × 63^2) - ( π × 58^2)

A = 3969π - 3364π

A =  605π

A = 1900.664 (rounded)

Perimeter is just C = 2πr

Bigger ring

C = 126π

C = 395.841 m

Smaller ring

C = 116π

C = 364.425