Find $x$ angle in triangle I need to find angle `x` in this isosceles triangle(20-80-80), by using pure geometry, if i can say so. If my calculations are correct (i tried another approach) answer should be `30`, but t...--prophetes.ai

Find $x$ angle in triangle I need to find angle `x` in this isosceles triangle(20-80-80), by using pure geometry, if i can say so. If my calculations are correct (i tried another approach) answer should be `30`, but there should be 'easy' way to find this. Also i found many Langley’s Adventitious Angles exercises which are very similar to mine but yet different. ![enter image description here](

Construct an equilateral triangle such that its sides are equal to the base of the main triangle. ![enter image description here](