Year 9 - Expressions and Formulae Review

Front

What is the formula for the perimeter of a rectangle?

Back

The perimeter (P) of a rectangle is given by the formula: P = 2(length + width).

Front

If the width of a rectangle is 'w' cm and its length is 'l' cm, how can we express the length in terms of the width if the length is 4 cm more than the width?

Back

The length can be expressed as: l = w + 4.

Front

What is the relationship between the perimeter, length, and width of a rectangle?

Back

The perimeter is the total distance around the rectangle, calculated as P = 2(length + width).

Front

If the perimeter of a rectangle is 28 cm, what equation can we set up using the width 'w' and the length 'l'?

Back

The equation is: 28 = 2(w + l).

Front

How do you isolate 'w' in the equation 28 = 2(w + l)?

Back

First, divide both sides by 2: 14 = w + l. Then, isolate 'w': w = 14 - l.

Front

If the width of a rectangle is 7 cm, what is the length if the length is 4 cm more than the width?

Back

The length is 7 + 4 = 11 cm.

Front

What are the dimensions of a rectangle if the width is 5 cm and the length is 4 cm more than the width?

Back

The width is 5 cm and the length is 5 + 4 = 9 cm.

Front

If a rectangle has a width of 8 cm, what is the perimeter?

Back

If the length is 4 cm more than the width, then length = 8 + 4 = 12 cm. The perimeter is P = 2(8 + 12) = 40 cm.

Front

What is the value of 'w' if the perimeter of a rectangle is 28 cm and the length is 4 cm more than the width?

Back

Setting up the equation: 28 = 2(w + (w + 4)). Solving gives w = 9 cm.

Front

What is the length of a rectangle if the width is 6 cm and the length is 4 cm more than the width?

Back

The length is 6 + 4 = 10 cm.