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 Nov 25, 2020

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The area of the octagon is the area of the original square minus the area of the four triangles.  

 

Area of the original square                                   20 • 20  =  400 

 

                                                                               1  

Area of one triangle                                              ––– • 4 • 4  =  8  

                                                                               2  

 

Area of all four triangles                                         4 • 8  =  32  

 

Area of octagon (square minus triangles)              400 – 32  =  368  

.

 Nov 25, 2020
 #1
avatar
+1
Best Answer

 

The area of the octagon is the area of the original square minus the area of the four triangles.  

 

Area of the original square                                   20 • 20  =  400 

 

                                                                               1  

Area of one triangle                                              ––– • 4 • 4  =  8  

                                                                               2  

 

Area of all four triangles                                         4 • 8  =  32  

 

Area of octagon (square minus triangles)              400 – 32  =  368  

.

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