Question

Panjang bf adalah...

Answer 1

CE = akar dr BC²-BE²
= akar dr 10²-6²
= akar dr 100-36
= √64 = 8 cm
maka :

BF/CE = AB/BC
BF/8 = 9/10
10.BF = 9.8
10.BF = 72 ----------> BF = 72/10 = 7,2 cm(A)

Answer 2

CE = √BC²-BE² = √10²-6²= √100-36 = √64 = 8 cm
Luas jajar genjang = a.t = ABxCE = 9.8 = 72 cm²
Luas jajar genjang = a.t= BFxBC = 72 cm²
BF = 72 / BC = 72 / 10 = 7,2 cm