Jawabanmu

2014-07-21T09:39:13+07:00
EB = \/10² - 6²
EB = \/100 - 36
EB = \/64
EB = 8 cm

EB = ED

EC = \/17² - 8²
EC = \/289 - 64
EC = \/225
EC = 15 cm

luas abcd
= d1 x d2 x 1/2
= (6 + 15) x (8 + 8) x 1/2
= 21 x 16 x 1/2
= 21 x 8
= 168 cm²