Free Lesson Plan Word Problems: Geometry

Students will learn how to use basic geometry to solve word problems

Mathematics, Geometry, Problem Solving

Objective

Students will learn how to use basic geometry to solve word problems

Directions

Perimeter
Perimeter is the length around a closed shape. It is computed by adding the length of all the sides of the figure. The formula for finding the perimeter of rectangles and other parallelograms is P = (l + w) x 2 or P = 2 l + 2 w

Area

The area of a flat surface is a measure of how much space is covered by that surface. Area is measured in square units.

Area of a Rectangle

The area of a rectangle is computed by multiplying the width of one side times the length of the adjoining side (A = l x w). The area of a rectangle can also be determined by multiplying the base times the height (A = b x h).

Area of a Triangle

A triangle is always one half of a rectangle or a parallelogram. The area of a triangle is computed by multiplying 1/2 of the base times the height of a triangle (A = 1-2 b x h)

Area of a Parallelogram

The area of a parallelogram is computed by multiplying the base times the height (A = b x h).

Area of a Circle

To find the area of a circle, multiply π (3.14) times the radius times the radius again (A = π r2).

Circumference

The circumference is the distance around a circle. To find the circumference of a circle, multiply π (which always equals 3.14) times the diameter or multiply 2 times π (3.14) times the radius (C = π d or C = 2 π r).

Volume

The formula for finding the volume of a rectangular prism, such as a box, is to multiply the length times the width times the height (V = l x w x h).
The formula for finding the volume of a cylinder is to multiply π (3.14) times the radius squared times the height (V = π x r2 x h ).
Volume is always computed in cubic units. Use cubic inches or centimeters when determining volume for small prisms and cylinders, and cubic feet or meters for larger ones.