India's golden triangle is a collection of 3 toursim places which are Delhi,Agra and Jaipur.
We called golden triangle as golden traiangle because If we see map of Republic of India and marks these 3 cities then it form a triangle .
Trip of golden triangle starts with countries capital Delhi then move to west you reach Jaipur(Rajasthan) which is also known as Pink city then move east you reach Agra(Uttar Pradesh).