Tolong yaa dikumpulin hari ini;)​

Jawab:

Penjelasan dengan langkah-langkah:

bangun layang-layang

keliling ABCD = 66 cm

AB = 20 cm

BD = 24 cm

misalkan titik potong AC dan BD disebut E

AE² = AB² – (1/2 BD)² = 20² – 12² = 256

AE = √256 = 16cm

BC + CD = keliling – 2AB = 66 – (2 x 20) = 26 cm

karena BC = CD   maka BC = CD = 1/2 x 26 = 13 cm

EC² = BC² – (1/2 BD)² = 13² –  12² = 25

EC = √25 = 5

diagonal AC = AE + EC = 16 + 5 = 21 cm

diagonal BD = 24 cm

Luas ABCD = 1/2 x diagonal AC x diagonal BD =

1/2  x 21 x 24 = 252 cm²

mudah-mudah gak salah hitung….