Draw two concentric circles in any two dimensions, draw a straight line with the center as the starting point, intersect the two circles respectively, make a circle with the intersection as the center and the unused dimension as the radius, and connect the three points to form the triangle you want. For example, 20 and 35 are concentric circles, with a straight line as the intersection point with 35 and 30 circles, and the intersection point between 30 and 20 circles as the third point.