I REALLY NEED HELP PLEASE!
What is the surface area of the regular pyramid given below?

Question

I REALLY NEED HELP PLEASE!
What is the surface area of the regular pyramid given below?

anonymous · Answer

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anonymous · Answer

area of a triangle - (ab)/2
4 similar triangle therefore, - 4 x (ab)/2
                                         - 2ab
                                         - 2x9x7
                                         -  126 
area of square - c^2
                      - 9^2
                      - 81

therefore total surface area = 126+81 
                                         = 207