## Description

The following riddles are used in this game.

an angle less than 90 degrees but more than 0 degrees~acute angle

a triangle whose interior angles are all acute~acute triangle

elevation above sea level or above the earth’s surface~altitude

the space between two lines or planes that intersect~angle

a continuous portion of a circle~arc

an area that is in the middle of some larger region~center

in or near an inner area~central

a combination of three or more notes that blend harmoniously~chord

ellipse in which the two axes are of equal length~circle

the length of the closed curve of a circle~circumference

two angles whose sum is a right angle~complementary angles

a shape with a circular base and sides tapering to a point~cone

corresponding in character or kind~congruent

of equal importance, rank, or degree~coordinate

lying in the same plane~coplanar

ratio of the adjacent side to the hypotenuse of a right-angled triangle~cosine

a surface generated by rotating a line around a fixed line~cylinder

a specific identifiable position in a continuum or series~degree

the length of a straight line through the center of a circle~diameter

the property created by the space between two objects~distance

a three-sided regular polygon~equiangular triangle

a three-sided regular polygon~equilateral triangle

being essentially equal to something~equivalent

the supplement of an interior angle of a polygon~exterior angle

the mean of n numbers expressed as the n-th root of their product~geometric mean

written on or in a surface~inscribed

a triangle with two equal sides~isosceles triangle

determine the dimensions of something or somebody~measure

relating to or situated in or extending toward the middle~median

a point equidistant from the ends of a line or the extremities of a figure~midpoint

an angle between 90 and 180 degrees~obtuse angle

a triangle that contains an obtuse interior angle~obtuse triangle

being everywhere equidistant and not intersecting~parallel

a quadrilateral whose opposite sides are parallel and equal~parallelogram

a line enclosing a plane area~perimeter

a closed plane figure bounded by straight sides~polygon

a solid figure bounded by plane polygons or faces~polyhedron

a polyhedron with two congruent and parallel faces~prism

relation with respect to comparative quantity or magnitude~proportion

a polyhedron having a polygonal base and triangular sides~pyramid

a four-sided polygon~quadrilateral

a straight line from the center to the perimeter of a circle~radius

relation with respect to comparative quantity or magnitude~ratio

a group of nearly parallel lines of electromagnetic radiation~ray

a parallelogram with four right angles~rectangle

having four right angles~rectangular

a polygon with all sides and all angles equal~regular polygon

a parallelogram with four equal sides~rhombus

the 90 degree angle between two perpendicular lines~right angle

a triangle with one right angle~right triangle

a triangle with no two sides of equal length~scalene triangle

a straight line that intersects a curve at two or more points~secant

a particular aspect of life or activity~sector

one of several parts that fit with others to make a whole~segment

the quality of being alike~similarity

ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle~sine

be at an angle~slope

a round three-dimensional closed surface~sphere

a polygon with four equal sides and four right angles~square

a quantity obtained by the addition of a group of numbers~sum

the extent of a 2-dimensional surface enclosed within a boundary~surface area

a line that touches a curve but does not intersect it~tangent

the act of changing in form or shape or appearance~transformation

extending or lying across~transversal

a quadrilateral with two parallel sides~trapezoid

a three-sided polygon~triangle

poorly balanced or matched in quantity or value or measure~unequal

either of two equal and opposite angles formed by the intersection of two straight lines~vertical angle