回答这个问题,要画图!An exterior angle at the base of on isosceles taiangle measures 130°.find the measure of the vertex angle.

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回答这个问题,要画图!An exterior angle at the base of on isosceles taiangle measures 130°.find the measure of the vertex angle.
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回答这个问题,要画图!An exterior angle at the base of on isosceles taiangle measures 130°.find the measure of the vertex angle.
回答这个问题,要画图!
An exterior angle at the base of on isosceles taiangle measures 130°.find the measure of the vertex angle.

回答这个问题,要画图!An exterior angle at the base of on isosceles taiangle measures 130°.find the measure of the vertex angle.

题目意思有点看不懂,英文不好,连蒙带猜的,也不知道对不对,图片如下: