Geometry Terminology

A right angle is ...

• An angle that is exactly equal to 90 degrees

• An angle that is greater than 90 degrees but less than 180 degrees

• An angle that is less than 90 degrees

• An angle that is exactly equal to 180 degrees

A straight angle is ...

• An angle that is exactly equal to 90 degrees

• An angle that is greater than 90 degrees but less than 180 degrees

• An angle that is less than 90 degrees

• An angle that is exactly equal to 180 degrees

An obtuse angle is ...

• An angle that is exactly equal to 90 degrees

• An angle that is greater than 90 degrees but less than 180 degrees

• An angle that is less than 90 degrees

• An angle that is exactly equal to 180 degrees

An acute angle is ...

• An angle that is exactly equal to 90 degrees

• An angle that is greater than 90 degrees but less than 180 degrees

• An angle that is less than 90 degrees

• An angle that is exactly equal to 180 degrees

A quadrilateral is defined as ...

• Squares with the same shape and size

• A 3D shape with four angles that equal 360⁰

• Two shapes with four sides each

• A 2D shape with four sides and four angles that equal 360⁰

A scalene triangle has ...

• Three different side lengths and three different internal angles

• Two sides equal in length and two equal angles

• A right-angle and a hypotenuse

• Three equal side lengths and three equal internal angles

An equilateral triangle has ...

• Three different side lengths and three different internal angles

• Two sides equal in length and two equal angles

• A right-angle and a hypotenuse

• Three equal side lengths and three equal internal angles

An isosceles triangle has ...

• Three different side lengths and three different internal angles

• Two sides equal in length and two equal angles

• A right-angle and a hypotenuse

• Three equal side lengths and three equal internal angles

A square is defined as ...

• Having 2 pairs of equal sides and 2 pairs of equal angles

• Having 4 equal sides and 4 90 degree angles

• Having 4 equal sides and 2 pairs of equal angles

• Having 2 pairs of equal sides and 4 90 degree angles

A rectangle is defined as ...

• Having 2 pairs of equal sides and 2 pairs of equal angles

• Having 4 equal sides and 4 90 degree angles

• Having 4 equal sides and 2 pairs of equal angles

• Having 2 pairs of equal sides and 4 90 degree angles