Chiều cao tg :
48 x 2 : 6 = 16 m
DT tg :
16 x 20 : 2 = 160 m2
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1 thua ruong hinh thang co day lon 52m day be bang 75% day lon neu tang day be them 10m tang day lon them 6m thi dien tich thua ruong se tang them 80m vuông tinh dien tich thua ruong
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Cho tam giac ABC co day BC =12cm. Keo dai day BC ve phia C thi dien tich tam giac tang them 24cm2. Tinh dien tich tam giac ABC
1. Cho hinh thang co day be 3/5 day lon, chieu cao 23cm. Keo dai day be day lon duoc hinh chu nhat dien tich tang len 207 cm2. Tinh dien tich hinh thang ban dau.2. Mieng dat hinh thang co dien tich 1053 m2. Neu tang day be 4m duoc hinh thang co dien tich bang 1107m2. Tim do dai moi day biet day lon hon day be 6m.3.Hinh thang co trung binh cong hai day 31cm. tang day be 3cm, day lon 6m thi dien tich tang len 36cm2. Tim dien tich hinh thang.4.Cho tam giac ABC. Tren AB lay AM bang 1/3 AB,tren AC la...
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1. Cho hinh thang co day be =3/5 day lon, chieu cao 23cm. Keo dai day be= day lon duoc hinh chu nhat dien tich tang len 207 cm2. Tinh dien tich hinh thang ban dau.
2. Mieng dat hinh thang co dien tich 1053 m2. Neu tang day be 4m duoc hinh thang co dien tich bang 1107m2. Tim do dai moi day biet day lon hon day be 6m.
3.Hinh thang co trung binh cong hai day 31cm. tang day be 3cm, day lon 6m thi dien tich tang len 36cm2. Tim dien tich hinh thang.
4.Cho tam giac ABC. Tren AB lay AM bang 1/3 AB,tren AC lay AN bang NCx2.
a) BN cat CM tai O.So sanh dien tich BOM va ONC.
b) Tinhdien tich ANB/ dien tich ABC.
c)Tinh dien tich tam giac ABC biet dien tich tam giac AMN= 16cm2.
cho hinh tam giac abc co dien tich 150 cm2 . Neu keo dai day bc ve phia b 5cm thi dien tich tang them 37 cm2 tinh day bc
cho 1 tam giac co day bang 24cm.Biet neu tang day them 6cm thi dien tich tam giac do tang them 48cm2 tinh dien tich tam giac da cho
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b)Mot hinh thang co tong hai day la 78dm,day lon bang 7/6 day nho .Chieu cao bang 1/2 day lon .Tinh dien ich hinh thang do