That's not a complete sentence. "How many sides of a rectangle..." what? "...Are there?" Four.
Here's a hint: read your questions before you hit the "go" button so as not to sound like an idiot.
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A rectangle has _____ sides.
does a rectangle prism have 6 sides
4 sides
A rectangle has 4 sides and 4 right angles.
A rectangle has 4 vertices and 4 sides