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2,7475=h/5
h= 5 * 2,7475
h= 13,74
sin70⁰=h\b
0,9397=13,74\b
0,9397b=13,74\:0,9397
b=14,62
P=½ a*h
P=½*10*13,74
P=68,7 cm^2
Ob=14,64+14,62+10
Ob=39,24 cm^2 = 39,2 cm^2