Question

Find the distance around the race track. use 3.1 for pi. 30m 100m​

Answer 1

293 m

Explanation:

Split the figure into 3 parts :

1. Left semicircle
2. Center rectangle
3. Right semicircle

Perimeter of the left semicircle

• P₁ = πr
• P₁ = 3.1 x 15 [half the diameter]
• P₁ = 46.5 m

Perimeter of the right semicircle

• It is the same perimeter of the left semicircle as the diameter is equal
• P₂ = 46.5 m

Perimeter of the rectangle

• Here we only need to consider the sum of the lengths of the rectangle
• P₃ = 2 x 100
• P₃ = 200

Distance around the race track

• P₁ + P₂ + P₃
• 46.5 + 46.5 + 200
• 293 m