Perimeter and area Flashcards
What is perimeter?
The distance around the outside of a shape. It is calculated as the sum of the lengths of all the sides of the shape.
Why are units of measurement important when calculating perimeter?
- To ensure accurate and consistent results. Using standard units like meters allows for clear communication and comparison of measurements.
How do you calculate the perimeter of a rectangle?
- Add the lengths of all four sides.
If you know the length (l) and width (w ), you can use the formula:
P = 21 + 2w
What skills are needed to solve perimeter problems?
Applying formulas and logical reasoning.
How can calculations involving multiplication and division help with perimeter-related problems?
- To find the number of items needed based on length and
dimensions. For example, determining how many fence posts are needed for a given perimeter.
What is the formula for the area of a rectangle?
Area = length × width
The patio measures 12 meters by 8 meters. What is the area of the patio?
96 m* (Area = 12 m x 8 m)
How do you find the radius of a circle if you know the diameter?
Radius = Diameter / 2
The diameter of the pool is 10 meters. What is the radius of the pool?
5 m (Radius = 10 m / 2)
What is the formula for the area of a circle? (Use )
Area = 7p2
- The radius of the pool is 5
meters. Using i = 3.14, what is the
area of the pool?
78.5 m (Area = 3.14 × (5 m) 3)
The patio area is 96 m?, and the pool area is 78.5 m?. What is the area of the patio excluding the pool?
17.5 m₴ (96 m? - 78.5 m})
How do you calculate the area of the patio?
Area of rectangle - Area of circle = 96 m2 - 78.5 m₴ = 17.5 m2
