Đáp án:
$ΔABC$
+ Có $MN//BC$
$→\dfrac{MN}{BC}=\dfrac{AK}{AH}$
$→MN=\dfrac{BC}{3}=\dfrac{15}{3}=5(cm)$
+ CÓ $EF//BC$
$\to \dfrac{EF}{BC}=\dfrac{AI}{AH}$
$→EF=\dfrac{2}{3}BC=\dfrac{2}{3}\times 15=10(cm)$
Sắp xếp lại trật tự để các câu sau tạo thành đoạn văn thích hợp a.Không lúc nào nó thèm bay bổng, thèm ca hát như lúc này(1).Bọ ve rạo rực cả người(2).Từ tít trên cao kia, mùi hoa lí tỏa xuống thơm ngát và tiếng những bạn ve inh ỏi b.Mặt nước sáng lóa(1).Trăng lên cao(2).Biển và trời những hôm có trăng đẹp quá(3).Bầu trời càng sáng hơn(4).Cả một vùng nước sóng sánh, vàng chói lọi(5)
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bạn nào giả được mik vote cho 5 sao
Câu 9: Cho tam giác ABC có AB = 6 cm, AC = 8 cm, BC = 10 cm. a) Chứng minh tam giác ABC vuông tại A. b) Tính góc B, góc C và đường cao AH của tam giác ABC. c) Tính bán kính r của đường tròn (O) nội tiếp tam giác ABC.
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