Areas of Triangles, Quadrilaterals, and Circles By: Mr. Sheldon

Area of a Triangle 𝐴𝑟𝑒𝑎= 1 2 𝑏ℎ b=Length of an Base h=Height or Length of an Altitude

Area of a Rectangle 𝐴𝑟𝑒𝑎=𝑙𝑤 𝑙= length of the rectangle w= width of rectangle

Area of a Square 𝐴𝑟𝑒𝑎= 𝑙 2 𝑙=length of any one side of the square

Area of a Parallelogram 𝐴𝑟𝑒𝑎=𝑏ℎ 𝑏=length of a base ℎ=length of the height

Area of a Trapezoid 𝐴𝑟𝑒𝑎= 1 2 𝑏 1 + 𝑏 2 ℎ 𝑏 1 = length of one base 𝐴𝑟𝑒𝑎= 1 2 𝑏 1 + 𝑏 2 ℎ 𝑏 1 = length of one base 𝑏 2 = length of the opposite base ℎ=height of the trapezoid

Circumference of a Circle 𝐶=2π𝑟 𝑟=radius of the circle π≈3.14159 Always give in terms of π before giving a decimal answer

Area of a Circle 𝐴=𝜋 𝑟 2 𝑟=radius of the circle π≈3.14159 Always give in terms of π before giving a decimal answer

Assignment Worksheet over area of triangles and quadrilaterals