Jawabanmu

2014-06-02T20:32:29+07:00
LM = √ 25² - 20² =√ 625 - 400 = √ 225 = 15 cm
L = a.t/2
= 15 . 20 / 2 = 150 cm²
2014-06-02T20:33:25+07:00
LM kuadrat = 25 kuadrat - 20 kuadrat
LM kuadrat = 625-400
LM kuadrat = 225
LM = 15 cm

luas = 20 cm x 15 cm : 2 = 150 cm