Karteikarten
Properties of Quadrilaterals to Solve Equations
Karten in diesem Stapel (6)
- 1The length of the rectangle is 2x+5 The width of the rectangle is 3x-2The perimeter of the rectangle is 46cm
- 2Find the value of x 1) What do I have to do? - Read the question through twice. Highlight or underline the important pieces of information in the question2) What information do I need?
- The key word in the question is perimeter.
- The question asks to find the value of x. The answer might be a whole number or a fraction or decimal - 33) What information don't I need? Everything in this question is relevant to working out the answer4) What maths can I do?
- 4Step A: Opposite sides in a rectangle are equal Write on the lengths (expressions) of the other sides on your diagramStep B:
The perimeter of a shape is found by adding up all the sides. Find an expression for the perimeter:
(2x + 5) + (3x - 2) + (2x +5) + (3x - 2) = 10x + 6
- 5Step C: The perimeter of the rectangle is 46cm, therefore: 10x + 6 = 46Step D:
Solve this equation to find x:
10x + 6 = 46
Move the 6 across: 10x = 46 - 6
(It becomes negative and vice versa)
10x = 40
Then divide 40 by 10
x = 4 - 65) Is my solution correct? Check the answer by substituting the value of x into the length and width. The length of the rectangle is: 2x+5 If x=4 then 2x4+5 = 13cmThe width of the rectangle is: 3x-2
If x=4 then 3x4-2 = 10cm
Check the original figure for the perimeter is reached by adding up all four sides:
13+10+13+10 = 46
Informationen
- Beschreibung
- Maths Karteikarten am Properties of Quadrilaterals to Solve Equations, erstellt von Liffey Farrell am 13/05/2017.
- Erstellt von
- Liffey Farrell
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- 13
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