Can someone please help with this it’s urgent!!
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Answer:a) 3 cmb) 140 cm²General Formulas and Concepts:Pre-AlgebraOrder of Operations: BPEMDAS Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right Equality PropertiesGeometryCircumference: C = 2πrSurface Area of a Cylinder: SA = 4πr²Step-by-step explanation:Step 1: DefineC = 21 cmStep 2: Find Radius rSubstitute [C]: 21 = 2πrIsolate r: 21/(2π) = rRewrite: r = 21/(2π)Evaluate: r = 3.34225 cmRound: r ≈ 3 cmStep 3: Find Surface AreaSubstitute [SAS]: SA = 4π(3.34225 cm)²Exponents: SA = 4π(11.1707 cm²)Multiply: SA = 44.6826π cm²Multiply: SA = 140.375 cm²Round: SA ≈ 140 cm²
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