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Area of a square
A=s²

Area of a rectangle
A=bh or A=lw

Area of a parallelogram
A=bh

Area of a triangle
A=1/2bh

Area of an equlateral triangle with side s

Area of a trapezoid

Area of a rhombus/kite

Regular polygon
a polygon that is both equilateral and equiangular

Sum of Interior angles of a convex polygon
Sum = 180(n-2), where n is the number of sides.

Measure of ONE interior angle of a REGULAR polygon

Sum of Exterior angles of a convex polygon

Measure of ONE exterior angle of a REGULAR polygon

30-60-90 Triangle Theorem
In a 30°-60°-90° triangle, the hypotenuse is twice as long as the short leg, and the long leg is √3 times as long as the short leg

45-45-90 Triangle Theorem
In a 45°-45°-90° triangle, the hypotenuse is √2 times as long as each leg.

The Apothem of a Regular polygon is
a perpendicular segment that is drawn from the center of a regular polygon to a side of the polygon

The Radius of a Regular polygon is
the distance from the center to a vertex.

Central Angle of a polygon
an angle formed by two radii drawn to consecutive vertices of the polygon

Area of a Regular polygon

SOHCAHTOA

Perimeters of Similar Polygons
If a:b is the scale factor of 2 similar polygons, then the ratio of their perimeters is a:b.
Areas of Similar Polygons
If a:b is the scale factor of 2 similar polygons, then the ratio of their areas is a²:b².

Circumference
the distance around a circle

Circumference of a circle
C=2πr or C=πd

Length of an arc of a circle

Area of a circle
A=πr²

Sector of a circle
the region bounded by two radii of a circle and the included arc.

Area of a Sector of a circle

Segment of a circle
is the region between a chord of a circle and the included arc.

Area of a Segment of a Circle
Area of a sector - Area of a triangle

Probability that a point will lie in the shaded region
is the ratio of the area of the shaded region to the area of the whole region.
