find the missing figure for each perimeter
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in the first figure,
perimeter= 21
and the sides of triangle = 6,10,a
21= 6+10+a
21-16=a
a=5
in second figure
perimeter= 39
and sides of trapezoid is 9,9,14,b
39= 9+9+14+b
39= 18+14+b
39= 32+b
b=39-32=7
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