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Actually it is circular but usually the sun needs to be quite low in the sky for the angle of the sunbeams hitting the raindrops to be suitable to create a rainbow visible from the ground. But, when that happens, a part of the rainbow is cut-off by the horizon and so it appears semicircular.

Full circles are rare but have been seen/photographed.

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Q: Why the rainbow is semi circle in shape?
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Related questions

What is the base shape of a semi - circle have?

semi-circle


What do you call a semi circle 3D shape?

A 3D semi circle


Why rainbow seems to be round high up in the air?

A rainbow appears as a circle when viewed from an airplane because the observer is seeing the full circular arc of the rainbow due to their high altitude. The shape of a rainbow is actually a full circle, but when viewed from the ground, the bottom half is usually blocked by the horizon. So, from higher altitudes, the full circle can be seen.


Can a rainbow be made in a different shape?

No, rainbows are always in the shape of a circular arc due to the physics of light refraction and reflection in water droplets. The shape of a rainbow is determined by the angle at which sunlight is refracted and reflected in the droplets in the atmosphere.


How many dimensions does a semi circle have?

A semi-circle is a two dimensional shape.


Is semi circle a 2D or 3D?

A semicircle is a two-dimensional (2D) shape. It is a closed curve that divides a circle into two equal parts, with one straight edge and one curved edge. In contrast, three-dimensional (3D) shapes have depth, width, and height, such as cubes, spheres, and pyramids.


Why is the shape of a rainbow an arc?

In reality, the shape of rainbow is a circle. The center of the circle is an imaginary line between the center of the sun and the head of the viewer.


Is a semi-circle a regular shape?

No it is a irregular shape


What shape are rainbows?

If you are in a airplane rainbows are actually a circle shape,but from our view it is semi-circle.


Is a Semi-circle a 2D shape?

Yes.


Why is rainbow formed in the sky in the shape of arc?

a rainbow is not shaped like a arc its a circle


Why the rainbow is always a semi circle?

Because the earth blocks you from seeing the full circle. You can use a misting garden hose to make a rainbow, and you'll see it's a full circle.