Math Basic Geometry: Shapes

An angle less than 90 degrees

• acute angle

• obtuse angle

• right angle

• straight angle

a figure made by two intersecting lines or two rays extending from the same point

• line
• point
• circle
• angle

An angle between 90 and 180 degrees

• straight angle

• obtuse angle

• right angle

• acute angle

a two-dimensional, four-sided shape made of two pairs of parallel sides of equal length that are opposite one another

• parallelogram

• triangle
• square
• circle

a two-dimensional, four-sided shape made of two pairs of parallel sides that are opposite one another and four right angles

• circle
• triangle
• square
• rectangle

a two-dimensional shape made of four sides of equal length and in which the pairs of opposite sides are parallel

• rectangle

• rhombus

• trapezoid

• triangle

a 90-degree angle formed by two perpendicular lines or line segments

• parallel lines

• right angle

• acute angle

• obtuse angle

a two-dimensional, four-sided shape that has four right angles and all sides are equal in length

• rectangle

• pentagon

• trapezoid

• square

a two-dimensional, four-sided shape with one pair of opposite sides that are parallel

• square
• rectangle
• trapezoid
• pentagon

a geometric figure that has three straight sides and three angles

• circle

• triangle

• square

• rhombus