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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 = 
bh,
where b is the length of the base and h is
height.
bh,
where b is the length of the base and h is
height.Sum of the Interior Angles of a Polygon
The sum of the interior angles of a polygon is (n –
2)180°, 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 = 2πr, where r is
the radius of the circle.
Arc Length
Arc Length = 
2πr, where n is
the measure of the degree of the arc, and r is
the radius of the circle.
2πr, where n is
the measure of the degree of the arc, and r is
the radius of the circle.Area of a Circle
Area = πr2,
where r is the radius of the circle.
Area of a Sector
Area of Sector = 
πr2,
where n is the measure of the central angle which
forms the boundary of the sector, and r is the
radius of the circle.
πr2,
where n is the measure of the central angle which
forms the boundary of the sector, and r is the
radius of the circle.|
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