Unit 4: Right Triangles & Similarity
Polygons with congruent corresponding angles and proportional corresponding sides
Pentagon
A polygon with five sides
Perimeter
Length around a 2D figure
A polyhedron with two congruent parallel polygon bases and parallelogram shaped lateral faces
Circle
The set of points equidistant from a center point
Sine
In a right triangle, the ratio of the opposite side of an angle to the hypotenuse
Parallelogram
A quadrilateral with two pairs of parallel opposite sides
Area
Amount of space inside a 2D figure
Surface Area
The sum of the area of all surfaces on a solid
Central Angle
An angle in a circle with the vertex in the center
Angle of elevation
The angle between a horizontal line and a point above the line
Square
A quadrilateral with four congruent angles and four congruent sides
Pythagorean Theorem
a2+b2=c2
Pyramid
A polyhedron with a polygon base and triangular lateral faces that meet at an apex
Secant
A line that intersects a circle at two points
Proportion
An equation stating that two ratios are equal
Kite
A quadrilateral with two pairs of consecutive congruent sides (opposite sides are not congruent)
Congruent figures
Figures that are the exact same size and shape
Volume
The amount of space inside a three-dimensional figure
Sector
A portion of the area of a circle (like a slice of pie)
Geometric mean
The square root of the product of two numbers
Isosceles trapezoid
A quadrilateral with exactly one pair of parallel opposite sides, with the non-parallel sides congruent
Quadratic Formula
x = (-b +- sqrt(b2 - 4ac))/(2a)
Lateral Area
The sum of the area of all lateral surfaces on a solid
Inscribed Angle
An angle in a circle with the vertex on the edge of the circle