Perimeter
Area
Random
Mental Maths
100
What is the formula for finding the perimeter of a rectangle and a square?
the perimeter of a rectangle = (length + width) x 2
the perimeter of a square=length of the side x 4
100
What is the area of a rectangle measuring 7m by 6m?
Perimeter=7x6=42m2
100
Find the perimeter of a regular nonagon with sides 8mm.
nonagon是九边形。
Perimeter of this nonagon=8x9=72mm
100
Work out the area of a rectangle measuring 7cm by 4cm.
Area=7x4=28cm2
200
What is the perimeter of a rectangle with sides 16mm and 67mm?
Perimeter=(16+67)x2=83x2=166mm
200
Find the area of a rectangle that has a width of 12cm and a length of 15cm.
12 x 15 = 180cm2
200
Workout the area and perimeter of the rectangle measuring 124mm by 23mm.
Area=124x23=2852mm2
Perimeter=(124+23)x2=147x2=294mm
200
A triangle has a perimeter of 24cm. All sides are the same length. What is the length of one side of the triangle? （
Length of each side=24÷3=8cm
300
A horse paddock is 30m long and 20m wide. How much electric tape would I need to buy to complete the paddock.
（30+20）x 2 = 100m
300
A horse paddock is 30m long and 20m wide. How much space would the horse have to move around?
30 x 20 = 600 m2
300
The width of a rectangle is 6m. Its length takes twice as long as its width. What is the perimeter of this rectangle.
Length of this rectangle=6x2=12m
Perimeter=(12+6)x2=18x2=36m
300
What is the perimeter of an equilateral triangle with sides 21cm.
An equilateral triangle has all 3 sides equal.
21x3=63cm
400
The perimeter of a square is equal to 88m. What is the length of the side of this square?
The perimeter of a square is equal to 4 times the length of one side. Since we are given the perimeter, to find the length of one side, we divide the perimeter by 4.
88 ÷ 4 = 22m
400
The perimeter of Ms. Kirsty's square backyard is 56 meters. What is its area?
Length of the side=56÷4=14m
Area=14x14=196m2
400
The area of a rectangle is 96 cm². If the width of the rectangle is 8 cm, find its length and perimeter.
Width=96÷8=12cm
Perimeter=(12+8)x2=20x2=40cm
400
What is the perimeter and area of a square with side 5cm.
Perimeter=5x4=20cm
Area=5x5=25cm2
500
9+10+9+10+7+7=52cm
500
The perimeter of a rectangle is 230 cm. If the length of the rectangle is 70 cm, find its width and area.
Width=230÷2-70=115-70=45cm
Area=70x45=3150cm2
500
The area of a square is 144m2. What is the length of one side of the square?
Length of each side of the square=12m
500
The area of a square is 64m2. Find its perimeter.
Length of the side = 8m
Perimeter of this square=8x4=32m