>
数学
>
如图,在梯形ABCD中,AB∥CD,AD=DC,求证:AC是∠DAB的平分线.
人气:204 ℃ 时间:2019-10-04 06:49:01
解答
证明:∵AB∥CD,
∴∠CAB=∠DCA.
∵AD=DC,
∴∠DAC=∠DCA.
∴∠DAC=∠CAB,
即AC是∠DAB的角平分线.
推荐
如图,在梯形ABCD中,AB∥CD,AD=DC,求证:AC是∠DAB的平分线.
梯形ABCD中,AB∥CD,AC平分∠DAB,DC:AB=1:1.5,求AD:BC
梯形ABCD中,AB∥CD,AC平分∠DAB,DC:AB=1:1.5,求AD:BC=?
等腰梯形ABCD中,AB平行DC,AC平分∠DAB,∠DAB=60°,若梯形周长为8,则AD为多少?
数学:在梯形ABCD中,DC//AB,AD=BC,AC平分∠DAB,∠DCA=30°,DC=3cm.求..
-1到-5之间只有3个负数._.(判断对错)
一道六年级语文题~~快来~急
different,in,Shanghai,was,many,years,ago,life,very连词成句
猜你喜欢
在一周内英语翻译
已知函数f(x)=log9(9^x+1)+kx (k∈R)是偶函数.
I’m from England!(同义句)
⑴Mary loves her belt very much.(提问) __ __Mary __
用无论总要造句
人,分别三天就得另眼相看的成语是什么?
必准确,英语高手进:ldidn't meet his wife____(she her)wasn't with him
煤气改天然气只需要换喷嘴吗?
© 2025 79432.Com All Rights Reserved.
电脑版
|
手机版