Angular shapes are geometric figures made with straight sides, edges, and clearly defined angles rather than curved boundaries. They include familiar shapes such as triangles, squares, rectangles, pentagons, hexagons, and other polygons, each having different numbers and types of angles. Learning the names of angular shapes is a useful way to improve English vocabulary while developing a basic understanding of geometry. In this article, you will learn angular shape names in English with clear pictures, helping kids, students, teachers, beginners, and English learners easily identify, compare, understand, remember, and use these common shape names with confidence in mathematics and everyday learning.
List of Angular Shapes Names in English
- Angle
- Acute Angle
- Right Angle
- Obtuse Angle
- Straight Angle
- Reflex Angle
- Complementary Angles
- Supplementary Angles
- Adjacent Angles
- Vertical Angles
- Alternate Angles
- Corresponding Angles
- Interior Angles
- Exterior Angles
- Triangle
- Acute Triangle
- Right Triangle
- Obtuse Triangle
- Equilateral Triangle
- Isosceles Triangle
Angular Shapes Names in English with Pictures
- Angle
An angle forms when two rays meet at one common endpoint, creating a measurable opening between them.
- Acute Angle
An acute angle measures less than 90 degrees, making a small and narrow opening between two rays.
- Right Angle
A right angle measures exactly 90 degrees and forms a square corner between two perpendicular lines.
- Obtuse Angle
An obtuse angle measures more than 90 degrees but less than 180 degrees, creating a wide opening.
- Straight Angle
A straight angle measures exactly 180 degrees and forms a straight line with two opposite rays.
- Reflex Angle
A reflex angle measures more than 180 degrees but less than 360 degrees, creating a large opening.
- Complementary Angles
Complementary angles are two angles whose measures add together to exactly 90 degrees.
- Supplementary Angles
Supplementary angles are two angles whose measures add together to exactly 180 degrees.
- Adjacent Angles
Adjacent angles share a common vertex and one common side without overlapping each other. - Vertical Angles
Vertical angles are opposite angles formed when two straight lines intersect and always have equal measures.
- Alternate Angles
Alternate angles are angle pairs formed by a transversal crossing two lines on opposite sides.
- Corresponding Angles
Corresponding angles occupy matching positions when a transversal crosses two lines, especially when those lines are parallel.
- Interior Angles
Interior angles are angles located inside a polygon or between two lines crossed by a transversal.
- Exterior Angles
Exterior angles are angles formed outside a polygon or outside the region between two lines.
- Triangle
A triangle is a three-sided polygon with three straight sides, three vertices, and three interior angles.
- Acute Triangle
An acute triangle has three interior angles, and each angle measures less than 90 degrees.
- Right Triangle
A right triangle has one right angle measuring exactly 90 degrees and two acute angles.
- Obtuse Triangle
An obtuse triangle has one angle measuring more than 90 degrees and two acute angles.
- Equilateral Triangle
An equilateral triangle has three equal sides and three equal angles, each measuring exactly 60 degrees.
- Isosceles Triangle
An isosceles triangle has at least two equal sides and two equal opposite angles.
Angular Shapes Names in English with Pictures
40 Angular Shape Name in English
- Scalene Triangle
- Quadrilateral
- Square
- Rectangle
- Rhombus
- Parallelogram
- Trapezoid
- Kite
- Pentagon
- Hexagon
- Heptagon
- Octagon
- Nonagon
- Decagon
- Undecagon
- Dodecagon
- Concave Polygon
- Convex Polygon
- Regular Polygon
- Irregular Polygon
Basic Angular Shapes Names with Pictures
- Scalene Triangle
A scalene triangle has three sides of different lengths and three angles with different measures.
- Quadrilateral
A quadrilateral is a four-sided polygon with four straight sides, four vertices, and four interior angles.
- Square
A square has four equal sides and four right angles, with opposite sides parallel to each other.
- Rectangle
A rectangle has four right angles, with opposite sides equal in length and parallel.
- Rhombus
A rhombus is a quadrilateral with four equal sides and opposite sides parallel.
- Parallelogram
A parallelogram is a quadrilateral with two pairs of opposite sides parallel and equal in length.
- Trapezoid
A trapezoid is a quadrilateral with at least one pair of opposite sides parallel.
- Kite
A kite is a quadrilateral with two pairs of adjacent sides equal in length.
- Pentagon
A pentagon is a five-sided polygon with five straight sides, five vertices, and five interior angles.
- Hexagon
A hexagon is a six-sided polygon with six straight sides, six vertices, and six interior angles.
- Heptagon
A heptagon is a seven-sided polygon with seven straight sides, seven vertices, and seven interior angles.
- Octagon
An octagon is an eight-sided polygon with eight straight sides, eight vertices, and eight interior angles.
- Nonagon
A nonagon is a nine-sided polygon with nine straight sides, nine vertices, and nine interior angles.
- Decagon
A decagon is a ten-sided polygon with ten straight sides, ten vertices, and ten interior angles.
- Undecagon
An undecagon is an eleven-sided polygon with eleven straight sides, eleven vertices, and eleven interior angles.
- Dodecagon
A dodecagon is a twelve-sided polygon with twelve straight sides, twelve vertices, and twelve interior angles.
- Concave Polygon
A concave polygon has at least one interior angle greater than 180 degrees, creating an inward indentation.
- Convex Polygon
A convex polygon has all interior angles less than 180 degrees, with no inward indentation along its boundary.
- Regular Polygon
A regular polygon has equal side lengths and equal interior angles throughout its geometric shape.
- Irregular Polygon
An irregular polygon has sides or angles that are not all equal, creating an uneven geometric shape.
Basic Angular Shapes Names with Pictures
Learn More Helpful Articles
Leave a Comment