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题目Two angles are complementary. One angle is 30 degrees. What is the measure of the other angle? A. 60 degrees B. 45 degrees C. 30 degrees D. 150 degrees 相关知识点: 试题来源: 解析 A。互补角之和为 90 度,一个角为 30 度,另一个角为 90 - 30 = 60 度。
What should we do first in this experiment? A. Measure the angles of incidence and refraction. B. Place the glass prism on a stable platform. C. Observe the path of the light ray inside the prism. D. Turn on the light source.
In a right triangle, one of the acute angles measures 45 degrees. What is the measure of the other acute angle? A. 45 degrees B. 60 degrees C. 30 degrees D. 90 degrees 相关知识点: 试题来源: 解析 A。在直角三角形中,两个锐角的和是 90 度。已知一个锐角是 45 度,那么另一个锐角...
A triangle has angles in the ratio of 2:3:4. What is the measure of the largest angle? A. 40 degrees B. 60 degrees C. 80 degrees D. 100 degrees 相关知识点: 试题来源: 解析 C。解析:三角形内角和为 180 度,设三个角分别为 2x、3x、4x,2x + 3x + 4x = 180,9x = 180,x =...
Two complementary angles are in the ratio of 2:3. What is the measure of the smaller angle? A. 36 degrees B. 54 degrees C. 72 degrees D. 108 degrees 相关知识点: 试题来源: 解析 A。互补角和为 90 度,设两角分别为 2x 和 3x,可得 2x + 3x = 90,解得 x = 18,所以较小角为...
In a right triangle, one of the acute angles is 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。解析:直角三角形两个锐角和为 90 度,一个锐角为 30 度,另一个锐角为 90 - 30 =...
It is often mistaken for triangulation, which is used to measure angles, not distances. Satellites orbiting the earth send signals to be read and interpreted by a GPS device, situated on or near the earth’s surface. To calculate location, a GPS device must be able to read the signal ...
In an isosceles triangle, one of the base angles is 70 degrees. What is the measure of the vertex angle? A. 40 degrees B. 70 degrees C. 110 degrees D. 140 degrees 相关知识点: 试题来源: 解析 A。等腰三角形两底角相等,三角形内角和为 180 度,已知底角为 70 度,所以顶角为 180 - 70×...
In a quadrilateral, the sum of three angles is 270 degrees. What is the measure of the fourth angle? A. 75 degrees B. 90 degrees C. 105 degrees D. 120 degrees 相关知识点: 试题来源: 解析 B。四边形内角和为 360 度,已知三个角的和为 270 度,那么第四个角为 360 - 270 = 90 度。