# Is an equilateral triangle a quadrilateral?

No.

All triangles have three sides and three angles, hence the root word "tri" which means "three".

All quadrilaterals have four sides and four angles, hence the root "quad" meaning "four".

A triangle will never be a quadrilateral, because they do not share traits. So no, an equilateral triangle is not a quadrilateral.

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No, an equilateral triangle is not a quadrilateral. A quadrilateral is a polygon with four sides and four vertices, while an equilateral triangle is a triangle with three equal sides and three equal angles.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

- Two rhombuses have sides with lengths of #15 #. If one rhombus has a corner with an angle of #(3pi)/8 # and the other has a corner with an angle of #(5pi)/6 #, what is the difference between the areas of the rhombuses?
- A parallelogram has sides A, B, C, and D. Sides A and B have a length of #2 # and sides C and D have a length of # 9 #. If the angle between sides A and C is #(3 pi)/8 #, what is the area of the parallelogram?
- How do you tessellate a quadrilateral?
- A parallelogram has sides with lengths of #15 # and #12 #. If the parallelogram's area is #42 #, what is the length of its longest diagonal?
- Two opposite sides of a parallelogram each have a length of #1 #. If one corner of the parallelogram has an angle of #(3 pi)/4 # and the parallelogram's area is #24 #, how long are the other two sides?

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