GMAT考试

根据网考网考试中心的统计分析，以下试题在2019/11/5日GMAT考试习题练习中，答错率较高，为：88%
【单选题】In triangleAB
C、above, if ∠BA
D、and ∠AD
B、have measures of 4n, ∠AC
B、has a measure of n, and ∠DB
C、has a measure of 45°, what is the measure of ∠AB
C、(Figure not necessarily drawn to scale.)


A、45°

B、60°

C、90°

D、105°
E、120°

网考网参考答案：D，答错率：88%
网考网试题解析：
The principle to remember here is that an exterior angle of a triangle--such as ∠ADB--is equal to the sum of the remote interior angles of the triangle, in this case ∠DBC and ∠DCB (=∠ACB) of triangle BDC. Thus, ∠DCB+∠DBC=4n, or ∠DBC=3n=45°, and therefore n=15° and 4n=60°. The three angles of a triangle must equal 180°, so ∠ABC=180°-60°-15°=105°. document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>