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krutsza podstawa :4 1/2 -2 1/5 =9/2-11/5=45/10-22/10=33/10
dłuzsza podstawa: 4 1/2+3 1/4=9/2+13/4=18/4+13/4=31/4
ob: 9/2 + 9/2 + 31/4+ 33/10 = 90/20 +90/20 +155/20 +66/20 = 401/20 =20 1/20 cm
4 1/2 + 3 1/4 = 4 2/4 + 3 1/4 = 7 3/4 cm - dłuższa podstawa
obw = (4 1/2 * 2) + 7 3/4 + 2 3/10
obw = 9 + 7 3/4 + 2 3/10
obw = 16 3/4 + 2 3/10
obw = 16 5/20 + 2 6/20
obw = 18 21/20
obw = 19 1/20 cm