Question

[Nguyen Thu Hoan]

cho tam giac ABC,coBC=60cm,duong cao AH=30cm.TrenAB lay diemEvaD sao choAE=ED=DB.TrenAC laydiemGvaK sao choAG=GK=KC.tinh dien tich hinhDEGK

Answer 1

[OoO Kún Chảnh OoO]

S_ABC = 60 x 30 : 2 = 900 (m²)

S_DCB = 1/3S_ABC = 900:3 = 300 (m²)

(DB=1/3AB; 2 tam giác có chung đường cao kẻ từ C)

S_ADC = 900-300 = 600 (m²)

Tương tự: S_DCK = 1/3S_ADC = 600 : 6 = 200 (m²)

SADK= 600 – 200 = 400 (m²)

S_DKG = S_DGA = S_ADK : 2 = 400 : 2 = 200 (m²)

S_GED = S_GDA : 2 = 200 : 2 = 100 (m²)

S_GEDK = S_GED + S_GDK = 100 + 200 = 300 (m²)

Answer 2

[van anh ta]

300 m²​ , ủng hộ mk nha