a)
[tex]a = 7\\b = 6\\h = 3\\\\P=a\cdot h\\\\P = 7\cdot3 = 21\\\\\\Obw = 2a+2b = 2(a+b)\\\\Obw = 2(7+6) = 2\cdot13 = 26[/tex]
b)
[tex]a = 16\\b = 4\\h = 8\\c=d = 10\\\\P = \frac{a+b}{2}\cdot h\\\\P = \frac{16+4}{2}\cdot8 = 20\cdot4 = 80\\\\\\Obw = a+b+2c\\\\Obw = 16+4+2\cdot10 =20+20 = 40[/tex]
