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0,4 dm=4cm
1/2*4 *h=26
2h=26 /:2
h=13 cm
a - podstawa = 0,4 dm = 4 cm
h - wysokość = ?
P = ah/2 /* 2
2P = ah
h = 2P/a = 2 * 26/4 = 52/4 = 13 cm