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Curves yes, straight lines no
Two curves which intersect at right angles, ( the angle between the two tangents to the curve) curves at the point of intersection are called orthogonal trajectories. The product of the slopes of the two tangents is -1.
There are none. Those two curves do not intersect.
Indifference curves do not intersect each other because each curve represents a different level of utility or satisfaction for a consumer. If two curves were to intersect, it would imply that the same combination of goods provides two different levels of utility, which is contradictory. Therefore, each curve must maintain a distinct and consistent level of satisfaction, ensuring that higher curves represent greater utility than lower ones. This reinforces the fundamental assumption of consumer preferences in economics.
The answer could be "intersect". If not, please edit the question to include more context or relevant information, and then resubmit.