Algebra I

Hong Kong

Stage 1 - Stage 3

The perimeter of a triangle with sides of length $x$`x`, $y$`y` and $z$`z` is given by the formula $P=x+y+z$`P`=`x`+`y`+`z`.

Find $P$`P` if the lengths of its sides are $x=6$`x`=6 cm, $y=3$`y`=3 cm and $z=7$`z`=7 cm.

Easy

Less than a minute

The perimeter of a square with side lengths of $a$`a` is given by the formula $P=4\times a$`P`=4×`a`.

Find $P$`P` if the length of each side is $5$5 cm.

The perimeter of a rectangle is given by the formula $P=2\times\left(l+w\right)$`P`=2×(`l`+`w`) , where $l$`l` is the length and $w$`w` is the width.

If the width of a rectangle is $10$10 cm and its length is $5$5 cm, find its perimeter.

The area of a rectangle is given by the formula $A$`A`$=$=Length$\times$×Width.

If the length of a rectangle is $2$2 cm and its width is $3$3 cm, find its area.

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