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Key Formulas
Pythagorean Theorem
a2 + b2 = c2,
where a and b are the lengths
of the legs of a right triangle and c is the length
of the hypotenuse.
Area of a Triangle
Area = 1/
2 bh,
where b is the length of the base and h is
the height.
Sum of the Interior Angles of a Polygon
The sum of the interior angles of a polygon is (n –
2)180º, where n is the number of sides in the
polygon.
Area of a Trapezoid
Area = 
h,
where s1 and s2 are
the lengths of the bases of the trapezoid and h is
the height.
h,
where s1 and s2 are
the lengths of the bases of the trapezoid and h is
the height.Area of a Parallelogram, Rectangle, and Rhombus
Area = bh, where b is
the length of the base and h is the height.
Area of a Square
Area = s2,
where s is the length of a side of the square.
Circumference of a Circle
Circumference = 2
r, where r is
the radius of the circle.
r, where r is
the radius of the circle.Arc Length
Arc length = 
2
r, where n is
the measure of the degree of the arc and r is the
radius of the circle.
2r, where n is
the measure of the degree of the arc and r is the
radius of the circle.Area of a Circle
Area = 
r2,
where r is the radius of the circle.
r2,
where r is the radius of the circle.Area of a Sector
Area of sector = 
r2,
where n is the measure of the central angle that
forms the boundary of the sector and r is the radius
of the circle.
r2,
where n is the measure of the central angle that
forms the boundary of the sector and r is the radius
of the circle.|
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