Front

What is a counterexample?

Back

A counterexample is an example that disproves a statement or proposition. For instance, if the statement is 'If an angle is obtuse, then it is 125°,' then 160° serves as a counterexample because it is obtuse but not equal to 125°.

Front

What is the formula for the area of a rectangle?

Back

The area of a rectangle can be found using the formula: Area = Length x Width.

Front

How do you find the length of a side in a triangle?

Back

To find the length of a side in a triangle, you can use the Pythagorean theorem if it's a right triangle, or apply the law of sines or cosines for other types of triangles.

Front

What is a property of a rhombus?

Back

One property of a rhombus is that its diagonals are perpendicular to each other.

Front

What is a tangent in geometry?

Back

A tangent is a line that touches a circle at exactly one point. For example, if DE is a line that touches a circle at point E, then DE is a tangent.

Front

What is the definition of an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90° but less than 180°.

Front

What is the difference between a rectangle and a rhombus?

Back

A rectangle has four right angles and opposite sides that are equal, while a rhombus has all sides equal in length but does not necessarily have right angles.

Front

What is the sum of the interior angles of a triangle?

Back

The sum of the interior angles of a triangle is always 180°.

Front

What is the formula for the perimeter of a rectangle?

Back

The perimeter of a rectangle can be calculated using the formula: Perimeter = 2(Length + Width).

Front

What is the definition of a right angle?

Back

A right angle is an angle that measures exactly 90°.