A right angle is an angle that measures exactly 90 degrees. It is often represented by a small square in the corner of the angle. In geometry, right angles are important in understanding the properties of shapes and in solving problems related to measurements and spatial reasoning.

- A right angle measures 90 degrees.
- When two lines intersect at a right angle, they form four 90-degree angles.
- A right angle is half of a straight angle, which measures 180 degrees.

Some common examples of right angles include:

- The corners of a square or rectangle
- The intersection of two perpendicular lines
- The hands of a clock at 3:00 or 9:00

To understand right angles better, it's important to remember the following key points:

- Memorize the definition of a right angle: a 90-degree angle.
- Practice identifying right angles in different shapes and objects around you.
- Understand the relationship between right angles and perpendicular lines.
- Work on problems that involve measuring and drawing right angles.

By mastering the concept of right angles, you'll be better equipped to tackle more advanced geometry topics and real-world applications of angles and shapes.

.Study GuideMeasurement, Perimeter, and Circumference Worksheet/Answer key

Measurement, Perimeter, and Circumference Worksheet/Answer key

Measurement, Perimeter, and Circumference Worksheet/Answer key

Measurement, Perimeter, and Circumference

Geometry (NCTM)

Use visualization, spatial reasoning, and geometric modeling to solve problems.

Use geometric models to represent and explain numerical and algebraic relationships.

Measurement (NCTM)

Apply appropriate techniques, tools, and formulas to determine measurements.

Select and apply techniques and tools to accurately find length, area, volume, and angle measures to appropriate levels of precision.

Develop and use formulas to determine the circumference of circles and the area of triangles, parallelograms, trapezoids, and circles and develop strategies to find the area of more-complex shapes.

Connections to the Grade 7 Focal Points (NCTM)

Measurement and Geometry: Students connect their work on proportionality with their work on area and volume by investigating similar objects. They understand that if a scale factor describes how corresponding lengths in two similar objects are related, then the square of the scale factor describes how corresponding areas are related, and the cube of the scale factor describes how corresponding volumes are related. Students apply their work on proportionality to measurement in different contexts, including converting among different units of measurement to solve problems involving rates such as motion at a constant speed. They also apply proportionality when they work with the circumference, radius, and diameter of a circle; when they find the area of a sector of a circle; and when they make scale drawings.