Meaning & use
congruent angle
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Meaning
nouncountablemathematics
One of two or more angles that have exactly the same measure in degrees.
Grammar: Often used in the plural: the angles are congruent.
Patterns
- congruent angles in a triangle
- an angle congruent to another
The base angles of an isosceles triangle are congruent angles.
Vertical angles form congruent angles where two lines cross.
Mark congruent angles with the same number of small arcs.
Word forms
| plural | congruent angles |
|---|
Common combinations
- prove angles congruent
- The first step is to prove the angles congruent.
- congruent angles and sides
- Congruent triangles have congruent angles and sides.
- mark congruent angles
- Mark congruent angles with matching arcs.
- vertical congruent angles
- Vertical angles are always congruent angles.
Synonyms and how they differ
- equal angles
- It is everyday phrasing and fine in school, though congruent is the exact geometry term for same shape and size.
- matching angles
- It is informal and may not mean exactly equal in measure.
- corresponding angles
- It refers to angles in the same position relative to a transversal, which may or may not be equal.
Opposites
Word family
- congruent adjective
- identical in shape and size
- congruence noun
- the quality of being congruent
- congruently adverb
- in a congruent way, rare
- angle noun
- the space between two lines that meet
Commonly confused: congruent angle or similar angle?
congruent angle vs similar angle
Similar shapes have equal angles but not necessarily equal sides; congruent shapes match in both.
Practice
Two angles are congruent angles when they ___.
Choose one answer.
Congruent angles have equal measures. The second and third are complementary and supplementary angles, which are different relationships.
Make it your own
Write a sentence using “congruent angle”, then check it and compare it with the examples above.