Respuesta :

Answer:

Step-by-step explanation:

larger radius R=87/2

smaller radius r=65/2

larger semi circle=1/2×2×π×R=π×R=π×87/2=87 π/2≈136.6 m

smaller semicircle =π×r=π×65/2=65 π/2≈102.1 m

length of track=87+65+136.6+102.1≈390.7 m

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