Diketahui Panjang AB = 15cm, AD = 20cm, dan AE = 12 cm. Tentukan luas daerah layang layang dan keliling layang-layang
L = 300 cm²
K = 70 cm
Penjelasan dengan langkah-langkah:
AC = 2 x AE = 2 x 12 = 24 cm
BE² = AB² - AE²
= 15² - 12²
= 225 - 144
= 81
BE = √81 = 9 cm
ED² = AD² - AE²
= 20² - 12²
= 400 - 144
= 256
ED = √256 = 16 cm
BD = 9 + 16 = 25 cm
L = 1/2 x d1 x d2
= 1/2 x AC x BD
= 1/2 x 24 x 25
= 300 cm²
K = 2(AB+AD)
= 2(15 + 20)
=2 x 35
= 70 cm
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