The perimeter is the sum of all four sides, so you need to calculate 2 x length + 2 x height. The fact that the rectangle is at the bottom of a triangle is irrelevant - except that in specific diagrams, information may be provided that lets you calculate the length or the width of the triangle.
I hope you want to know the Perimeter. Perimeter is the total length of the boundary of the region bounded by a shape. For a rectangle it is the sum of the 4 bounding sides, or 2*(L+B), where L is Length of the rectangle and B is Breadth of the rectangle. For a Triangle it is the sum of the 3 sides. If you consider an equilateral triangle. By property the 3 sides of an equilateral triangle are equal. Hence the Perimeter of an equilateral triangle is denoted as; 3*a, where a is the length of one of the sides of the triangle. It is possible that the perimeter of a rectangle is same as that of many different types of triangles. We can formulate a relationship for a special case where the perimeter of a rectangle is equal to the perimeter of an equilateral triangle; P(R) = P(ET), P(R) is perimeter of rectangle and P(EQ) is perimeter of Equilateral triangle. P(R)=2(L*B) = P(EQ) = 3*a; hence, a = (2/3)*(L*B) = P(R)/3. i.e., the sides of the Equilateral triangle are one thirds of the perimeter of the rectangle.
Triangle square & rectangle
the perimeter of a rectangle is calculated by : 2*(l+b)
The length of a rectangle is twice its width. If the perimeter of the rectangle is , find its area.
It is not in all but a trivial sense - that they are both to do with finding the perimeter!
find the perimeter and area of a rectangle that is 15cm long and 5cm wide
The perimeter of a triangle is the distance around it. Add the lengths of the three sides to find the perimeter.
the length of a rectangle is 5 more then the width. Find the perimeter and the area of the rectangle
Triangle = sum of its 3 sides Square = sum of its 4 sides Rectangle = sum of its 4 sides
Perimeter of which geometry (square, circle, rectangle, triangle, ...)