Question

Jawab sama caranya kk, makasih

Answer 1

Verified answer

Luas ABC = 54 cm²
1/2 x 7,2 x BC = 54
3,6BC = 54
BC = 15 cm

7,2² = (15 - BD) x BD
51,84 = 15BD - BD²
BD² - 15BD + 51,84 = 0

BD12 = [15 +/- akar(225 - 207,36)]/2
= (15 +/- akar17,64)/2
= (15 +/ 4,2)/2

BD = (15 + 4,2)/2 = 9,6 cm
BD = (15 - 4,2)/2 = 5,4 cm

Sehingga dari gambar dpt disimpulkan bahwa panjang BD < CD.
BD = 5,4 cm