Triangle pose is a version of Warrior One and two combined together. However, they call it triangle because you're going to look like you're creating a triangle from your base.
So, center your weight with your feet turned out in a second position through all corners of the feet. Take that back foot, point it towards the center of the room. Turn out in the front foot, with your knee stacked with your ankle. And, we're just going to come down and we're going to release. And, it's going to look like we're resting our elbow on our thigh. But, really you're lifting up out and over. And, now we're going to extend the opposite arm. Spread your fingers, release and look up. And, feel a nice release in the hip flexors. Opens up the chest. And, release come neutral. Breathing, inhale and exhale the whole time. One more time, we're going to point the back toe towards the front of the room. Turn out in the opposite direction with the other foot. Rest our elbow towards our thigh. Big inhale, reach on extension. And, if you loose your balance just look towards something that doesn't move. And, if you can look away and maintain. Activate your center of gravity, your core strength. Hold for about ten to twenty seconds. With breath, inhale and exhale. And, release.
Again, for beginners always make sure that your aware of the active range of motion and turn out in the knee joint. And, as you get more advanced you can release the stretch a little further on extension. And, have one hand towards the floor and the other in the opposite direction towards the ceiling.