circumference is the outside of a circle.
perpendicular is a horizontal line which touches a vertical line.
verticy is the corner of a shape.
segment is a small part of a circle.
arch is a small part of the circumference.
acute is an angle smaller than 90 degrees.
obtuse is a angle larger than 180 degrees.
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other words for multiplication
Multiplication
What is hard for some people may not be hard for others. So there is really no answer to this question.
2x 2 squared
Kilometre , kilogram