(1)作法利用量角器测得∠AOC=90°,AE即为所求;
(2)作法:
①以点B为圆心,以任意长为半径画弧,两弧交∠ABC两边于点M,N.
②分别以点M,N为圆心,以大于
1
2 MN的长度为半径画弧,两弧交于点P
③作射线BP,则射线BP为角ABC的角平分线;
④射线BP交AC于点F;
(3)作法:用量角器测得∠ABC=∠GEC,EG即为所求;
(4)作法:利用量角器测得∠BHC=90°,CH即为所求.
(1)作法利用量角器测得∠AOC=90°,AE即为所求;
(2)作法:
①以点B为圆心,以任意长为半径画弧,两弧交∠ABC两边于点M,N.
②分别以点M,N为圆心,以大于
1
2 MN的长度为半径画弧,两弧交于点P
③作射线BP,则射线BP为角ABC的角平分线;
④射线BP交AC于点F;
(3)作法:用量角器测得∠ABC=∠GEC,EG即为所求;
(4)作法:利用量角器测得∠BHC=90°,CH即为所求.