hai goc phu nhau 

la 2 goc =90 

tia p/g  cua 1 goc 

=tia nam giua 2 canh ay 2 goc = nhau

hai goc ke nhau

=la vua bu ; vua ke bu

tong so phan bang nhau:

2+3=5(phan)

chieu dai la:

(45:5)*3=27 (m)

chieu rong la:

(27:3)*2=18 (m)

dien h thua ruong la:

27*18= 486 (m²)

dap so: 486 m²