1. C. Trapezoid

• A trapezoid is a quadrilateral with one pair of opposite sides parallel. Sometimes people define trapezoids to have at least one pair of opposite sides parallel, and sometimes say there is one and only one pair of opposite sides parallel.

2. A. Square

• A square is one of the most basic geometric shapes. It is a special case of a parallelogram that has four congruent sides and four right angles. A square is also a rectangle because it has two sets of parallel sides and four right angles. A square is also a parallelogram because its opposite sides are parallel.

3. B. Rectangle

• Rectangle: A parallelogram with 4 right angles.

4. E. Rhombus

• Rhombus: A parallelogram with 4 sides with equal length.

5. D. Parallelogram

• A parallelogram is a quadrilateral with 2 pairs of parallel opposite and equal sides. Similarly, the opposite angles in a parallelogram are equal in measure.

6. G. Isosceles Triangle

• An isosceles triangle therefore has both two equal sides and two equal angles.

7. H. Scalene

• A scalene triangle has three different angles and none of its sides are equal in length

8. F. Equilateral Triangle

• A triangle with all sides equal is called an equilateral triangle, An equilateral triangle is therefore a special case of an isosceles triangle having not just two, but all three sides and angles equal.

9. J. Right Triangle

• A triangle that has one right angle is called a right triangle.

10. I. Obtuse Triangle

• A triangle that has one obtuse angle is called an obtuse triangle.

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