Books and Articles by Amber Kuang

Geometry is full of formulas, properties, and theorems. You can become successful in geometry by remembering the most important ones and learning how to apply them. Use this reference sheet as you practice various geometry problems to grow your knowledge and skills.Geometry practice problems with triangles and polygonsA polygon is a geometric figure that has at least three sides.

Coordinate geometry is the study of geometric figures graphed on a coordinate plane. The slope formula can be used to determine whether lines are parallel or perpendicular. The midpoint can be used to determine if segments are bisected and also can be used to find the center of a circle. The distance formula can be used to determine the lengths of sides of geometric figures.

In geometry, the point in a triangle where the angle bisectors of the triangle intersect is called the incenter. The following practice questions test your skills at finding the incenter of a given triangle. Practice questions Point I is the incenter of triangle CEN. Use the following figure and the given information to solve the problems.

You can identify triangles by their angle measurements. Using the fact that all angles in a triangle add up to 180 degrees, you apply some algebra to determine whether a triangle is equiangular, isosceles, scalene, right, acute, or obtuse. Practice questions Triangle WXY is drawn with extended to Use the diagram and the given information to classify each triangle as acute, obtuse, equiangular, or right.

When you transform geometric shapes, you may be changing their size, location, appearance, or all three. The following practice questions ask you to perform transformations that include reflection, rotation, translation, and dilation. Practice questions In a composition of transformations, two or more transformations are combined to form a new transformation.

In geometry, special right triangles are great to work with because the ratio of their sides will always be the same, making calculations easier. The two special triangles you need to know are the isosceles (or 45-45-90) and 30-60-90 right triangles. You can use your knowledge of special right triangles to answer the following questions.

When two triangles are similar, this means that their sides are in proportion. The following word problems ask you to use the properties of similar triangles—and a little bit of algebra—to find the solutions. Similar triangles are different only in size. The corresponding angles still have the same measure. Practice questions The lengths of the sides of a triangle are 16, 23, and 31.

In geometry, when you rotate an image, the sign of the degree of rotation tells you the direction in which the image is rotating. A positive degree measurement means you're rotating counterclockwise, whereas a negative degree measurement means you're rotating clockwise. The following practice questions test your knowledge of rotations by asking you to rotate an octagon, and then to rotate coordinates of an image about the origin.