Jawabanmu

2014-06-01T19:03:54+07:00
T = √ 13² - 5² = √ 169 - 25 =√ 144 = 12cm
K = CA + AB + BC
44 cm = 13 cm + AB + 20 cm
AB = 44 cm - 33 cm = 11 cm

L = a .t / 2 = 11 . 12 / 2 cm =66 cm²