To convert radians to degrees, multiply by <math><mstyle displaystyle="true"><mfrac><mrow><mn>180</mn></mrow><mrow><mi>π</mi></mrow></mfrac></mstyle></math> , since a full circle is <math><mstyle displaystyle="true"><mn>360</mn><mi>°</mi></mstyle></math> or <math><mstyle displaystyle="true"><mn>2</mn><mi>π</mi></mstyle></math> radians.

Combine <math><mstyle displaystyle="true"><mn>4.5</mn></mstyle></math> and <math><mstyle displaystyle="true"><mfrac><mrow><mn>180</mn></mrow><mrow><mi>π</mi></mrow></mfrac></mstyle></math> .

Multiply <math><mstyle displaystyle="true"><mn>4.5</mn></mstyle></math> by <math><mstyle displaystyle="true"><mn>180</mn></mstyle></math> .

Replace <math><mstyle displaystyle="true"><mi>π</mi></mstyle></math> with an approximation.

Divide <math><mstyle displaystyle="true"><mn>810</mn></mstyle></math> by <math><mstyle displaystyle="true"><mn>3.14159265</mn></mstyle></math> .

Convert to a decimal.

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