Odpowiedź :
c)
[tex] \frac{(a + b) \times h}{2} = \frac{(14 + 14 - 3 - 3) \times 4}{2} = \frac{(28 - 6) \times 4}{2} = \frac{22 \times 4}{2} = 11 \times 4 = 44[/tex]
Pierwszy trapez:
a = 7 cm
b = 12 cm
h = 4 cm
P = 0,5(a+b)h = 0,5(7+14)4 = 2*21 = 42 [j²]
Drugi trapez:
a = 10 cm
b = 6 cm
h = 10-6 = 4 (trójkąt 45°,45°,90°, więc h = a)
P = 0,5(a+b)h = 0,5(10+6)4 = 2*16 = 32 [j²]
Trzeci trapez:
a = 14 cm
b = 14-2*3 = 14-6 = 8
h = 4
P = 0,5(a+b)h = 0,5(14+8)4 = 2*22 = 44 [j²]