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21=8,3+3,7/2 *h
21=6h
h=3,5cm
1/2 razy12 razy x =21
1/2 razy 12= 6.
21: 6=3,5
pole= 1/2 razy 12 razy 3.5 = 6 razy 3.5 = 21.
a=3,7cm
b=8,3cm
h=?
P=(a+b)/2 *h
21=(3,7+8,3)/2 *h
21=12/2 *h
21=6 *h
21/6=h
H=3,5cm