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Độ dài chiều cao của tam giác là:
\(256\times2:32=512:32=16\left(\operatorname{cm}\right)\)
Độ dài đoạn đáy tăng thêm là:
72x2:16=144:16=9(cm)
Chiều cao của tam giác là:
\(7,5:\frac32=7,5\times\frac23=5\left(\operatorname{cm}\right)\)
Diện tích tam giác ABC là:
\(14\times\frac52=7\times5=35\left(\operatorname{cm}^2\right)\)
Đường cao tam giác ABC là:
\(7,5\text{×}2:3=5\left(cm\right)\)
Diện tích tam giác ABC là:
\(14\text{×}5:2=35\left(cm^2\right)\)
\(\text{Đ}S:35cm^2\)
Chiều cao của tam giác là:
\(7,5:\frac32=7,5\times\frac23=5\left(\operatorname{cm}\right)\)
Diện tích tam giác ABC là:
\(14\times\frac52=14\times2,5=35\left(\operatorname{cm}^2\right)\)
độ dài đường cao của ΔABC là:
\(35:\frac52=35\times\frac25=14\left(\operatorname{cm}\right)\)
Diện tích tam giác ABC là:
\(20\times\frac{14}{2}=20\times7=140\left(\operatorname{cm}^2\right)\)
Chiều cao tam giác ABC là:
40*2:5=16(cm)
Độ dài đoạn BC là:
120*2:16=15(cm)
Đáp số:15cm
Chiều cao của tam giác ABC là :
24 : 2 : 5 = 2,4 ( cm )
Độ dài đoạn BC là :
120 : 2 : 2,4 = 25 ( cm )
Đáp số : 25 cm.
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