TYPES OF QUADRILATERALS
RECTANGLE
A rectangle is any quadrilateral with four right angles. It can also be defined as an equiangular quadrilateral, since equiangular means that all of its angles are equal (360°/4 = 90°). It can also be defined as a parallelogram containing a right angle.
To find the area of a rectangle, multiply the length by the width. The formula is:, where is the area, is the length, is the width, and · means multiply.
The perimeter of a rectangle is the distance around the outside of the rectangle. A rectangle has four sides with opposite sides being congruent. The formula for finding the perimeter is Side A + Side B + Side A + Side B. This could also be stated as 2*Side A + 2*Side B or 2*(Side A + Side B)
To find the area of a rectangle, multiply the length by the width. The formula is:, where is the area, is the length, is the width, and · means multiply.
The perimeter of a rectangle is the distance around the outside of the rectangle. A rectangle has four sides with opposite sides being congruent. The formula for finding the perimeter is Side A + Side B + Side A + Side B. This could also be stated as 2*Side A + 2*Side B or 2*(Side A + Side B)
TRIANGLE
A triangle is a 3-sided polygon sometimes (but not very commonly) called the trigon. Every triangle has three sides and three angles, some of which may be the same.
To find the area of a triangle, multiply the base by the height, and then divide by 2. The division by 2 comes from the fact that a parallelogram can be divided into 2 triangles. We can also use the Heron's formula i.e. Area = √s(s-a)(s-b)(s-c), where a, b and c are the sides of the triangle.
Like any polygon, the perimeter is the total distance around the outside, which can be found by adding together the length of each side. Or as a formula:
perimeter = a+b+c where:
a,b and c are the lengths of each side of the triangle
To find the area of a triangle, multiply the base by the height, and then divide by 2. The division by 2 comes from the fact that a parallelogram can be divided into 2 triangles. We can also use the Heron's formula i.e. Area = √s(s-a)(s-b)(s-c), where a, b and c are the sides of the triangle.
Like any polygon, the perimeter is the total distance around the outside, which can be found by adding together the length of each side. Or as a formula:
perimeter = a+b+c where:
a,b and c are the lengths of each side of the triangle