(a+b)*h
P = -----------------
2
(a+5)*3 1/3
20 = -------------- /*2
40 = 3 1/3 a + 5*3 1/3
3 1/3 a = 40 - 16 2/3
10/3 a = 23 1/3 /*3/10
70 * 3
a= --- ---
3 10
a = 7
druga podstawa ma długość 7
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(a+b)*h
P = -----------------
2
(a+5)*3 1/3
20 = -------------- /*2
2
40 = 3 1/3 a + 5*3 1/3
3 1/3 a = 40 - 16 2/3
10/3 a = 23 1/3 /*3/10
70 * 3
a= --- ---
3 10
a = 7
druga podstawa ma długość 7