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The given figure is the lateral face of ...

The given figure is the lateral face of a square pyramid 'A B=A C=25' centimetres and 'B D=D C=15' centimetres.
'(##VPU_TTT_MAT_X_P02_C08_E14_001_Q01##)'
a) What is the length of its. base edge?
b) Find the lateral surface area of the pyramid.

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