Lesson: Chapter - 6
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 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 = s1 + s2 / 2 , h
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 = 2pr, where r is the radius of the circle.
Arc Length
Arc Length = n/ 360o × 2pr, where n is the measure of the degree of the arc, and r
is the radius of the circle.
Area of a Circle
Area = pr2, where r is the radius of the circle.
Area of a Sector
Area of Sector = n/ 360o × pr2, 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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