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có 45 đoạn thẳng hàng
vì n.(n - 1 ) : 2 = 10.(10-1) :2 =45 đoạn
đúng hông ta ??
M________________P________________N
a/vì M;N;P thẳng hàng mà MP<MN(5cm<10cm)
=>P nằm giữa M và N
b/ vì P nằm giữa N ;M
=>MP+PN=MN
=>5+PN=10
=>PN=5cm
=>PM=PN=5cm
c/ vì P nằm giữa M và N
mà PM=PN=5cm
nên P là tia phân giác của MN
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Số đường thẳng là:
\(\frac{2016.\left(2016-1\right)}{2}=2031120\)(đường thằng
1 điểm cắt 104 điểm còn lại tạo nên 104 giao điểm.Vậy có 104x105 giao điểm.Vì mỗi đường thẳng được tính 2 lần là\(\frac{104.105}{2}=5460\)giao điểm
