Example The circumference of a spherical gas storage tank is 50 m. What is the surface area of the tank? Solution A. What is the radius of the storage tank? 2π = 50 m r = 50 7.96 m ÷ (_____² _π) m What is the surface area of the tank? Use this formula: SA sphere = 4fr = 47( m)², or The surface area of the tank is about m² m². NEL

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