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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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Earn +20 ptsQ: Why the rainbow is semi circle in shape?
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Continue Learning about Math & Arithmetic
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
Is a semi-circle a regular shape?
No it is a irregular shape
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.
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.
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