Q: What shape has 3 straight side?

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A scalene triangle.

A scalene triangle.

If there are no angles, all you have is a 'straight side'. There is a plane and no shape. Maybe you are thinking that straight means standing up straight. You might then be thinking of an upright tube.

a circle

A shape with at least one side that is not straight, a shape where a pair of straight lines cross one another (like an angular figure of 8).

Related questions

A scalene triangle.

A scalene triangle.

A two-dimensional shape with one curved side and four straight sides can be created, but there is not specific name for such a shape.

If there are no angles, all you have is a 'straight side'. There is a plane and no shape. Maybe you are thinking that straight means standing up straight. You might then be thinking of an upright tube.

a circle

A shape with at least one side that is not straight, a shape where a pair of straight lines cross one another (like an angular figure of 8).

Extend any straight side of a shape. The angle made by that side with the adjacent side of the shape is an exterior angle. Its value is 180 degrees less the interior angle.

Yes

There is no specific name for such a shape.

If you are referring to a shape, then a semi-circle would be the most likely shape that contains one straight side and one curved. Take a look at a protractor, it's a semi-circle.

They all have sides, and they are all shapes.

No not just any shape that has 8 side can be called an octagon. An octagon has straight lines that make up a closed bounded shape.