In the case of a rectangle with different side lengths, this is a bit more complicated since we need to know the area and one of its sides to calculate the length of the other side.įor example, if the area of a rectangle equals 100 square meters and one of its sides is 20 meters, we simply divide 100 by 20 to get the length of the other side. Therefore, if we have the area of a square, we can calculate its sides by taking the square root of the area.įor example, if we have that the area of a square is 100 square meters, we can take the square root to obtain 10 meters, which is the length of its sides. In the case of a square, this becomes very easy since a square is a special case of a rectangle that has all its sides equal, so its area is equal to one of its sides squared. The formula for the area of a rectangle is A = base × height. If we know the area of a rectangle, we can calculate its sides using the formula for the area of a rectangle. How to calculate the sides of a rectangle knowing the area? Therefore, the area of the rectangle will be equal to the sum of the areas of these two triangles. In the rectangle below, its diagonal divides it into two equal right triangles. Why is the area of a rectangle equal to base times height? Step 3: Write the answer in square units. Step 2: Multiply the base and height values. Step 1: Identify the dimensions of the base and the height from the given information. We can find the area of a rectangle by following these steps: How to calculate the area of a rectangle? By multiplying the base times the height, the area of the rectangle gets dimensions in square units. The area of any rectangle is calculated once its base and height are known. Since all the sides in a square are equal, the area of the square will be equal to the length of one of its sides squared. The square is a special case of a rectangle, which has all equal sides. Therefore, we can say that the region enclosed by the perimeter of the rectangle is its area. On the other hand, when we talk about the perimeter of the rectangle, we know that it is equal to the sum of its four sides. Basically, the formula for the area is equal to the product of the base and the height of the rectangle. The area of a rectangle depends on its sides. The formula for calculating the area of a rectangle is A=Base×Height. In the case of a right triangle, the base and height are the two sides that are perpendicular or at 90 degrees to each other.What is the formula to find the area of a rectangle? Once we have the base and height, we can use the following formula: Okay, this is a little tricky, but it makes more sense looking at the picture below. The height is the distance from the vertex opposite to the base at a 90 degree angle to the base. To figure out the surface area of a triangle, we need to know the base and the height. Try this and see if you get the same answer. We could have also divided it up into these two different rectangles. Now we can add the surface area of the two rectangles: This looks confusing at first, but we can make this easier by dividing it up into two rectangles like this: What is the surface area using yards for the units? Since this is a rectangle we can use the rectangle formula: The perimeter of this football field is the sum of all the sides 100 + 50 + 100 + 50 = 300 yards. We used this same example to demonstrate how to figure the perimeter (see perimeter for kids). ![]() Let's take the more complicated example of this football field. When we give the answer for surface area we used squared to indicate that it's a surface area and not just a straight line. Note: if the units were feet for this problem, the answer would be 16 feet squared. ![]() Let's try that and see if we get the same answer: With a rectangle and square we can also get the surface area by multiplying width (W) x length (L).
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