2023年2月14日 · ∠bac＝80＝∠b，ac＝bc， 以bc为边作正 bce，连ae， ∠abe＝80－60＝20＝∠acd， ab＝cd，be＝bc＝ac， abe≌ acd， ∠aeb＝∠cad，∠ace＝40，∠cae＝∠cea＝70， ∠aeb＝10， ∠adb＝20+10＝30度。

Crafted from high-strength aluminum, the BC80 boasts exceptional strength, efficiency, and a level of luxurious comfort unmatched by any other catamaran in its size range. The Bering BC80 is a true explorer’s dream. With standard 700 horsepower engines, it effortlessly reaches speeds of up to 15 knots.

答案是70度，要坐3条辅助线，求完整解答。 解：作∠BAE＝∠B＝80 （点E在直线AC的外侧）,取AE＝AB，连接DE、CE∵∠B＝80, ∠A＝20∴∠ACB＝180-∠B-∠A＝80∵.

#bc80ab color RGB value is (188,128,171). #bc80ab hex color red value is 188, green value is 128 and the blue value of its RGB is 171. Cylindrical-coordinate representations (also known as HSL) of color #bc80ab hue: 0.88 , saturation: 0.31 and the lightness value of bc80ab is 0.62.

Its massive solar panel array, combined with a high-capacity lithium-ion battery bank and a state-of-the-art “kick-saving” system, significantly reduces generator dependence. This innovative system allows you to enjoy silent cruising for up to 24 hours without running the generators. Accommodation Options for Every Journey:

2010年11月12日 · 在三角形abc中，ab=ac,角bac=80°o为三角形abc内一点，且角obc=10°，角oca=20°，求角bao的度数过a作ap⊥bc交co延长线于p，连pb。 由∠BAC=80°，AB=AC，∴∠ABC=∠ACB=50°，得：∠ABO=40°，∠OCB=30°，由AP⊥BC

In ∆ ABC, BC = AB and ∠B = 80°. Then ∠A is equal to. Solution: From the question, In ∆ ABC, BC = AB and ∠B = 80°. As BC = AB, ∆ ABC is an isosceles triangle. Consider ∠C = ∠A = x. ∠B = 80° [Given] Using the angle sum property. We know that the sum of interior angles of a triangle = 180°. ∠A + ∠B + ∠C = 180°. Let us substitute the values.

在bc下方取一点d，使得三角形abd为等边三角形，连接dp、dc，根据等边三角形的性质得到ad=ab=ac，求出∠dac、∠acd、∠adc的度数，根据三角形的内角和定理求出∠abc=∠acb=50°，即∠cdb=140°=∠bpc，再证 bdc≌ bpc，得到pc=dc，进一步得到等边 dpc，推出 apd≌ apc，根据 ...

2022年2月22日 · 以bc为边，在a的同侧构建等边 bcd，连接ad， 因db=dc，ab=ac，ad=ad 所 以 dab≌ dac 因角bdc=60°，所以∠adb=30°, 因角bac=80°，ab=ac， 所以∠abc=50°， 所以∠dba=30° 在 dab与 ocb中 ∠dba=∠obc bd=bc ∠bda=∠bco=30° 所以 dab≌ ocb 所以bo=ba …

In triangle ABC, BC=AB and angle B= 80, then angle A = 50. Solution: Given that in triangle ABC, BC = AB which means ABC is an isosceles triangle. We know the sum of angles in a triangle is 180°. Since it is an isosceles triangle the measure of two angles will be same. Let ∠A = x and ∠c = x. We know, Sum of all angles = 180°. x+x+80° = 180°.