百度试题 结果1 题目如图,在\triangle ABC中,\angle C =60\degree,以AB为边作等边\triangle ABD,过点D作DE\bot CB交CB的延长线于点E,若BE=2,BC=10,则AC的长为___。相关知识点: 试题来源: 解析 7
在\triangle{ABC} 中,b+c=4,\angle{A}=60\degree,求\triangle{ABC} 面积的最大值。相关知识点: 试题来源: 解析 解:三角形\triangle{ABC} 的面积S=\dfrac{1}{2}bcsinA=\dfrac{\root \of {3} }{4} b(4-b)=-\dfrac{\root \of {3} }{4} (b-2)^2+\root \of {3}当b=2时,S有...
叫者量三看在\triangle ABC 中,\angle A=60\degree,b=12,S_{\triangle ABC }=18\sqrt{3} ,则\displa
所以\sin B=\frac{\frac{\root \of {3} }{2} \times 2}{\root \of {6} }=\frac{\root \of {2} }{2}, 所以\angle{B} =45\degree。 本题主要考查解三角形; 根据\frac{\sin A}{a} =\frac{\sin B}{b}, 求出\sin B, 根据三角函数值计算出\angle{B} =45\degree。
在\triangle{ABC} 中,已知AB=10,BC=6,\angle{B} =60\degree,则AC=。 相关知识点: 试题来源: 解析 2\root \of {19} 由余弦定理得:|AC|^2=b^2=a^2+c^2-2ac\cos B=100+36-2\times 10\times 6\times \frac{1}{2} =2\root \of {19}...
(For example, 60 and 80 are in a 3:4 ratio with a factor of 20) Let 4x = the measure of the smallest angle of the triangle. We can now say that 5x and 9x = the degree measures of the remaining angles of the triangle. We simply add 4x + 5x + 9x, equated the sum to 180 ...
(For example, 60 and 80 are in a 3:4 ratio with a factor of 20) Let 4x = the measure of the smallest angle of the triangle. We can now say that 5x and 9x = the degree measures of the remaining angles of the triangle. We simply add 4x + 5x + 9x, equated the sum to 180 ...
a triangle has angles measuring 30 degrees, 60 degrees, and 90 degrees. what is the length of the side opposite the 30-degree angle if the hypotenuse is 10 units long?一个三角形的角度分别为30度、60度和90度。如果斜边长为10个单位,那么对应30度角的边长是多少? 查看本题试卷 英文摘要 115...
在\triangle ABC 中,由三角形内角和定理可得\angle BAC=180\degree-\angle B-\angle C =180\degree-50\degree-30\degree =100\degree。 由题意可得MN为AC的中垂线, 所以AD=DC, 所以\angle DAC =\angle C=30\degree , 所以\angle BAD=\angle BAC-\angle DAC =100\degree-30\degree=70\degree 。 故...
(v) so that the second line connect to the side of the triangle with a 90 degree angle. So I need to get this line, by calculate v with the data I got like shown below The angle of the triangle(30 degrees here). Will always be 90 degrees or under. As a...