10. In triangle ABC, AB is congruent to BC and the measure of angle ABC is120 degrees. What is the measure of angle ACB?★B120AC120 degrees60 degrees45 degrees30 degrees 相关知识点: 试题来源: 解析 a_n+1=m∠a_1+13=m∠a 反馈 收藏 ...
In a triangle ABC, angle A = 60 degrees, angle B = 70 degrees. What is the measure of angle C? A. 50 degrees B. 60 degrees C. 70 degrees D. 80 degrees 相关知识点: 试题来源: 解析 A。三角形内角和是 180 度,已知角 A 和角 B 的度数,那么角 C 的度数为 180 - 60 - 70 =...
第一题:可以用正弦定理得:sinA /a=sinB /b所以得sinA=1/2,所以angle A=30°第二题:由韦达定理得: 方程根=[(-2i±√(4i2 16)]/2=-i±√3所以选e希望答案能满意.反馈 收藏
In triangle ABC, the measure of angle A is 25° and the measure of angle B is greater than 90°. Which of the following could be the measure of angle C? Indicate all such measures. A12° B15° C45° D50° E70° 显示答案 登录后才可以添加做题笔记哦,还没有账号? 马上注册 KMF...
首先,你有拼写错误,neasure应该是measure.从题意看,三角形应该是abc,而不是abe.角B是角A的3倍,角C比角A大30度.角B=3*角A,角C=角A+30度角A+角B+角C=180,得出角A=30度.因此角B=90度,角C=60度.相关推荐 1再来条英文数学题IN TRIANGLE ABE,THE NEASURE OF ANGLE B IS THREE TIMES THE MEASUR...
D 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°...
百度试题 结果1 题目20. Measure the length BC in the triangle below.B AC Ans:cm 相关知识点: 试题来源: 解析 7 反馈 收藏
In triangle QRS, the measure of angle Q = 30 degrees. Angle R is a right angle. The length of side RS is 7. What is the length of side OR?O 14 O 14 radical 3 相关知识点: 试题来源: 解析 7 tan30=(9R)/(QR) 反馈 收藏 ...
Let the incircle of a Delta ABC touches sides BC, CA and AB at D,E and... 06:59 Let H be the orthocentre of triangle ABC. Then angle subtended by side... 03:23 If in a triangle ABC, r(1)+r(2)+r(3)=9r, then the triangle is necessar... 01:40 In triangle ABC, r=(...
In a right triangle, if one acute angle measures 30 degrees, what is the measure of the other acute angle? A. 30 degrees B. 45 degrees C. 60 degrees D. 90 degrees 相关知识点: 试题来源: 解析 C。在直角三角形中,两个锐角之和为 90 度。已知一个锐角为 30 度,所以另一个锐角为 90...