1 manh dat hinh vuong duoc mo rong ve ben phai 5m phia tren 5m nen dien tich tang them 125m2 . tinh dien tich
Hinh thang vuong ABCD coAB = AD = 1/2DC . mo rong hinh thang ve phia canh ben de co hinh chu nhat AECD , biet phan mo rong co dien tich 32 m2 . tinh dien tich hinh thang ABCD
San tap the duc hinh vuong duoc mo rong ben phai them 2m va phia duoi them 4m de thanh hinh chu nhat co chu vi 100m. Tinh dien tich ban dau san tap
mieng dat hinh chu nhat co chieu dai gap 3 lan chieu rong.Nguoi ta mo ve 3 phia mot phia theo chieu dai va hai phia theo chieu rong thi dien tich tang them 123m2 . Tinh dien tich mieng dat sau khi mo rong , biet rang mo rong moi phia them 3m
cho 1 hinh thang ABCD co tong hai day AB va BC la 24 cm. neu mo rong lay nho them 5 cm thi dien tich hanh thang se tang them 30 cm2 . tinh dien tich hinh thang da cho ( ve hinh ro giai)
nguoi ta mo rong mot cai ho nuoi ca hinh vuong ve 4 phia , moi phia rong 9m.Sau khi mo rong dien tich ho tang len 972m vuong . tinh dien tich ho sau khi mo rong.
cho hinh thang abcd co ab bang ad bang 1/2 cd. mo rong hinh thang ve phia canh ben de co hinh chu nhat aecd,phan mo rong co dien tich la 50m2 .vay dien tich hinh thang abcd la ?
mot hinh thang vuong co day be bang 3/5 day lon va chieu cao la 23m .Nguoi ta mo rong thua ruong ve phia canh ben khong vuong goc voi hai day de thua ruong thanh hinh chu nhat .Sau khi mo rong dien tich tang len 207m2 .
a,Tinh dien tich hinh thang ban dau
b,Tinh xem sau khi mo rong dien tich tang len bao nhieu phan tram
ghi cach giai giup minh nhe .Cam on.
ngwoi ta mo rong 1 cai San hinh vwong ve ca 4 phia,moi phia them 4m nen dien tich tang them 240 met vwong.tinh\
a,canh San saw khi mo rong\
b,cach san trc khi mo rong[\
phim liet cac ban thong cam