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Area of Basic Shapes

Triangle, Circle, Parallelogram, Trapezoid

QuestionAnswer
The area formula for a triangle is... (1/2)*b*h
The area formula for a parallelogram (including rectangle and square) is... b*h
The area formula for a rhombus (using diagonals) is... (1/2)d1*d2
The area of a trapezoid is... (1/2)*h*(b1+b2)
The area of a circle is... pi*r^2
The circumference of a circle is... 2*pi*r
When determining the height of an object, always remember that the height must be... PERPENDICULAR to the base!
The area of a regular polygon is... (1/2)*a*p (a=apothem, p=perimeter)
In a 45-45-90 triangle, the length of the hypotenuse is... (length of leg)*(sq.rt. 2)
In a 30-60-90 triangle, the length of the longer leg is... (length of shorter leg)*(sq.rt.3)
In a 30-60-90 triangle, the length of the hypotenuse is... (length of shorter leg)*2
Created by: mburke79