A 60 degree angle is an acute angle in geometry. An equilateral triangle is called a 60 degree angle triangle as the measure of each angle in it is equal to 60 degrees. We can construct a 60 degree angle using a protractor, compass, and ruler....
叫者量三看在\triangle ABC 中,\angle A=60\degree,b=12,S_{\triangle ABC }=18\sqrt{3} ,则\displa
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...
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。
若在\triangle ABC中,\angle A = {60\degree},b = 1,{S_{\triangle ABC}} = \sqrt 3 ,则 \frac{{a + b + c}}{{\sin A + \sin B + \sin C}} =___。相关知识点: 试题来源: 解析 \frac23\sqrt{39} 本题主要考查应用正余弦定理解三角形。 S_{\triangle ABC}=\frac12bc\sin...
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}...
解:根据三角形的内角和定理可得\angle{C} =180\degree-70\degree-60\degree=50\degree ∴\angle{E} =\angle{C} ∵\angle{A} =\angle{D} =70\degree ∴\triangle{ABC} \backsim\triangle{DFE} (2) 解:\triangle{AOB} \backsim\triangle{COD},理由如下: ∵AB/\!/CD ∴\angle{ABO} =\angle...
60\degree 在\triangle{ABC} 中, \angle{ABC} +\angle{ACB} =180\degree-\angle{A} =180\degree-60\degree=120\degree ∵\angle{ABC} +\angle{FBC} =180\degree,\angle{ACB} +\angle{ECB} =180\degree, ∴\angle{FBC} +\angle{ECB} =360\degree-(\angle{ABC} +\angle{ACB} ) =180\degree...
The 60-degree-angle regular triangular pyramid inserted connection ball is novel and skillful in conception and attractive in appearance; and the components are manufactured regularly and are combined simply and firmly.李伯姗