Find the surface are of the regular pyramid

Answer:
[tex]1,240.4mm^{2}[/tex]
Explanation:
Triangle: 20x16/2=[tex]160mm^{2}[/tex]
[tex]160mm^{2}[/tex]x5 =[tex]800mm^{2}[/tex]
[tex]800mm^{2}[/tex]+[tex]440.4mm^{2}[/tex] = [tex]1,240.4mm^{2}[/tex]
Answer: 1,240.4mm2 is the answer
Step-by-step explanation: