Jawabanmu

2014-06-02T19:10:41+07:00
Sisi = K : 4 = 20 cm : 4 = 5cm
= √ 5² + 4² = √ 25 - 16 =√ 9 = 3 cm
L = d1 . d2 / 2 = 6 . 8 / 2 = 24 cm²