Current location - Training Enrollment Network - Mathematics courses - In the comprehensive practice class of mathematics
In the comprehensive practice class of mathematics
Solution: (1) Measurement method:

① Make a straight line Mn on the other side different from point A;

② Observe AB ⊥ manganese;

③ Take two points C and D on the straight line MN to make BC = CD.

(4) The crossing of D is DE⊥MN, and the three-point * * * line of A, C and E is made, and the length of DE is river width.

(2) In Rt△ABC and Rt△EDC,

∠ABC=∠EDC=90,BC=CD,∠ACB=∠ECD,

∴Rt△ABC≌Rt△EDC.

∴AB=ED.

Want a map?