Finding the area of a rectangle how to#

Regular polygon area formula: A = n × a² × cot(π/n) / 4.How good is each measurement We can use the fractional uncertainty, or. Quadrilateral area formula: A = e × f × sin(angle) I measure a rectangle with my ruler, and find L 10 +/- 1 cm and w 5 +/- 1 cm.Octagon area formula: A = 2 × (1 + √2) × a².

Finding the area of a rectangle how to#

Hexagon area formula: A = 3/2 × √3 × a² Students learn how to calculate the area of rectangles by counting unit squares and the perimeter by adding side lengths, and then by using the formulas length.

Pentagon area formula: A = a² × √(25 + 10√5) / 4 The formula for the area A of a rectangle is: A lw, where l is the length of the rectangle and w is the width of the rectangle.

If a rectangle has a base of length 6 inches and a height of 4 inches, its area is 6424 square inches.

Trapezoid area formula: A = (a + b) × h / 2 How to find the area of a rectangle: The area of a rectangle can be found by multiplying the base times the height.

The diagonal of a rectangle divides it into two congruent right triangles.

$finding the area of a rectangle$

Explain to your students that it is the space inside a shape.

Ask your students if they know what the word area means. Since the area of a rectangle is a product of its length and width, we need to find the width. /rebates/2fgremath-help2fhow-to-find-the-area-of-a-rectangle&. (5 minutes) Tell your students that they will be learning how to find the area of a rectangle.

Circle sector area formula: A = r² × angle / 2 Find the area of the rectangle below that has a diagonal of 26 and length of 24.

Note: Sometimes, base and height are used instead of length and width. For the sake of clarity, we'll list the equations only - their images, explanations and derivations may be found in the separate paragraphs below (and also in tools dedicated to each specific shape).Īre you ready? Here are the most important and useful area formulas for sixteen geometric shapes: The area, A, of a rectangle is the product of its length, l, and width, w. Well, of course, it depends on the shape! Below you'll find formulas for all sixteen shapes featured in our area calculator.