Equations from complex shapes | Maths | Quizalize & Oak National Academy

Starter quiz

Given that the perimeter of this rectangle is 76 cm, then $x=$ ______.

'5' ✓
Which of these equations are true for this square?

$2(x+1)+2(3x-7)+(18-2x)=7x-18$

$7x-18=18-2x$ ✓

$2(3x-7)=18-2x$ ✓

$2(3x-7)-(7x-18)=2(x+1)$

$(18-2x)^2=(7x-18)(2(3x-7))$ ✓
The perimeter of this isosceles triangle is 53 cm. The length of the unmarked edge is ______ cm.

'7' ✓
Given that this is a parallelogram, complete the equation: $5x-9=$ ___________.

$11y+3$

$6y$ ✓

$7(x-1)$
Given that these two shapes have equal areas, then $x=$ ______.

'3' ✓
The area of this rectangle is 48 square centimetres. The perimeter is ______ cm.

'28' ✓

Loading worksheet ...

Loading presentation ...

Sometimes you are given a problem with insufficient information to reach a numerical value.
Depending on the problem, it may be possible to write more than one equation.
It is possible these equations can be combined to write a new, more succinct, equation.

Some pupils may have an equivalent algebraic expressions without noticing.

Tell pupils to always check if their expressions can be simplified or factorised before deeming themselves incorrect.

Equation - An equation is used to show two expressions that are equal to each other.
Perimeter - The perimeter is the distance around a 2D shape.
Area - The area is the size of the surface and states the number of unit squares needed to completely cover that surface.