Right Angle - Geometry - Math Dictionary

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Angle Degree Ninty degree

Untitled Document

Right Angle
Definition of Right Angle

Right angle is an angle that has a measure of 90°.

Examples of Right Angle

The figure below shows a right angle.

Solved Example on Right Angle

One of the angles in a triangle is 90°. What type of a triangle is it?
Choices:
A. equilateral triangle
B. obtuse triangle
C. right triangle
D. acute triangle
Correct Answer: C
Solution:
Step 1: A triangle in which one of the angles is 90° is called a right triangle.

Related Terms for Right Angle

Angle
Right Triangle

Additional Links for Right Angle

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Browse for solved examples below on this Math Dictionary term:

SC BM Curriculum > Grade > Measurement > I.A.2: Compare the size of a given angle with a right angle (greater than, less than, or equal to) and classify as obtuse, acute, or right.

SC BM Curriculum > Grade 3 > Measurement > I.A.2: Compare the size of a given angle with a right angle (greater than, less than, or equal to) and classify as obtuse, acute, or right.

GA GPS BM curriculum > Second Grade > Geometry > M2G1: Students will describe and classify plane figures (triangles, square, rectangle, trapezoid, quadrilateral, pentagon, hexagon, and irregular polygonal shapes) according to the number of edges and vertices and the sizes of angles (right angle, obtuse, acute).

GA GPS BM curriculum > Second Grade > Geometry > M2G2.b: Recognize the shape of an angle as a right angle, an obtuse or acute angle.

California Assessment Curriculum - 2006 > Grade > Geometry & Measurements > 3MG2.2-Identify attributes of triangles (e.g., two equal sides for the isosceles triangle, three equal sides for the equilateral triangle, right angle for the right triangle).

California Assessment Curriculum - 2006 > Grade 3 > Geometry & Measurements > 3MG2.2-Identify attributes of triangles (e.g., two equal sides for the isosceles triangle, three equal sides for the equilateral triangle, right angle for the right triangle).

California Assessment Curriculum - 2006 > Grade > Geometry & Measurements > 3MG2.4-Identify right angles in geometric figures or in appropriate objects and determine whether other angles are greater or less than a right angle.

California Assessment Curriculum - 2006 > Grade 3 > Geometry & Measurements > 3MG2.4-Identify right angles in geometric figures or in appropriate objects and determine whether other angles are greater or less than a right angle.

California Assessment Curriculum - 2006 > Grade 4 > Geometry & Measurements > 4MG3.5-Know the definitions of a right angle, an acute angle, and an obtuse angle. Understand that 90°, 180°, 270°, and 360° are associated, respectively, with 1/4, 1/2, 3/4, and full turns.

Minnesota Assessment curriculum - 2006 > Grade 4 > Geometry and Measurement > V.B.2-Identify right angles in geometric figures or in appropriate objects and determine whether other angles are greater or less than a right angle.

Massachusetts Assessment Curriculum - 2006 > Grade > Interpreting Geometry > 3.G.3-Identify angles as right angles, less than a right angle, and greater than a right angle.

Massachusetts Assessment Curriculum - 2006 > Grade 3 > Interpreting Geometry > 3.G.3-Identify angles as right angles, less than a right angle, and greater than a right angle.

GA Assessment Curriculum - 2006 > Second Grade > Geometry > M2G2.b-Recognize the shape of an angle as a right angle, an obtuse or acute angle.

New York Assessment Curriculum - 2006 > Grade 7 > Interpreting Geometry > 7.G.5-Identify the right angle, hypotenuse, and legs of a right triangle.

South Carolina Assessment Curriculum - 2006 > Grade > Exploring Measurement > I.A.2-Compare the size of a given angle with a right angle and classify as obtuse, acute, or right.

South Carolina Assessment Curriculum - 2006 > Grade 3 > Exploring Measurement > I.A.2-Compare the size of a given angle with a right angle and classify as obtuse, acute, or right.

Indiana Assessment Curriculum - 2006 > Grade > Interpreting Geometry > 3.4.2-Identify right angles in shapes and objects and decide whether other angles are greater or less than a right angle.

Indiana Assessment Curriculum - 2006 > Grade 3 > Interpreting Geometry > 3.4.2-Identify right angles in shapes and objects and decide whether other angles are greater or less than a right angle.

Kansas Assessment Curriculum - 2006 > Grade 7 > Geometric Figures and Their Properties – The student recognizes geometric figures and compares their properties in a variety of situations. > 3.1.6-The student uses symbols for right angle within a figure, parallel, perpendicular, and triangle to describe geometric figures.

Maryland Assessment Curriculum - 2006 > Grade 8 > Properties of Plane Geometric Figures > 2.A.2.b-Analyze geometric relationships: Apply right angle concepts to solve real-world problems.

Delaware Assessment Curriculum - 2006 > Algebra - 2 > Standard 3: Students will develop Geometric Reasoning and an understanding of Geometry and Measurement by solving problems in which there is a need to recognize, construct, transform, analyze properties of, and discover relationships among geometric figures; and to measure to a required degree of accuracy by selecting appropriate tools and units. > Classification: Connect the right angle relationships with the unit circle and periodic functions for any angle.

Delaware Assessment Curriculum - 2006 > Algebra 2 > Standard 3: Students will develop Geometric Reasoning and an understanding of Geometry and Measurement by solving problems in which there is a need to recognize, construct, transform, analyze properties of, and discover relationships among geometric figures; and to measure to a required degree of accuracy by selecting appropriate tools and units. > Classification: Connect the right angle relationships with the unit circle and periodic functions for any angle.

Georgia Assessment Curriculum - 2006 > Second Grade > M2G2 Students will describe and classify solid geometric figures according to such things as the number of edges and vertices and the number and shape of faces and angles. > M2G2.b-Recognize the shape of an angle as a right angle, an obtuse angle, or an acute angle.

NCERT Assessment Curriculum 2007 > Grade 5 > SHAPES & SPATIAL UNDERSTANDING > Represents right angle, acute angle and obtuse angle by drawing and tracing.

NCERT Assessment Curriculum 2007 > > Triangles > (Motivate) If a perpendicular is drawn from the vertex of the right angle to the hypotenuse, the triangles on each side of the perpendicular are similar to the whole triangle and to each other.

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