Perimeter
Area
Random
Mental Maths
100
What is the formula for finding the perimeter of a rectangle and a square? （求长方形和正方形周长的公式是什么？）
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? （一个长方形，长7米，宽6米，求面积。）
Perimeter=7x6=42m2
100
Find the perimeter of a regular nonagon with sides 8mm. （一个规则九边形的边长为8毫米，它的周长是多少？）
nonagon是九边形。
Perimeter of this nonagon=8x9=72mm
100
Work out the area of a rectangle measuring 7cm by 4cm. （一个长方形长7厘米，宽4厘米，计算它的面积）
Area=7x4=28cm2
200
What is the perimeter of a rectangle with sides 16mm and 67mm? （求一个长67毫米，宽16毫米的长方形的周长。）
Perimeter=(16+67)x2=83x2=166mm
200
Find the area of a rectangle that has a width of 12cm and a length of 15cm. (一个长方形宽为12厘米，长为15厘米，它的面积是多少？)
12 x 15 = 180cm2
200
Workout the area and perimeter of the rectangle measuring 124mm by 23mm.一个长方形，长124毫米，宽23毫米，它的面积和周长分别是多少？
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? （一个等边三角形的周长为24厘米，请问它的边长是多少？ ）
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. （一片长方形的马场长30米，宽20米。现要用绝缘带将马场围住，请问绝缘带需要多长。）
（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?（一片长方形的马场长30米，宽20米，马的活动范围多大？）
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. 一个长方形的宽为6米，它的长是宽的两倍。这个长方形的周长是多少？
Length of this rectangle=6x2=12m
Perimeter=(12+6)x2=18x2=36m
300
What is the perimeter of an equilateral triangle with sides 21cm. （一个边长为21厘米的等边三角形，它的周长是多少？）
An equilateral triangle has all 3 sides equal.
21x3=63cm
400
The perimeter of a square is equal to 88 dm. What is the length of the side of this square?（一个正方形周长为88分米，该正方形边长多少。）
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 = 22 dm
400
The perimeter of Ms. Kirsty's square backyard is 56 meters. What is its area? 柯老师的后院是一个周长为56米的正方形，请问它的面积有多大。
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. （一个长方形的面积是96平方厘米。如果它的宽是8厘米，请问它的长和周长是多少？）
Width=96÷8=12cm
Perimeter=(12+8)x2=20x2=40cm
400
What is the perimeter and area of a square with side 5cm. （一个边长为5厘米的正方形，它的周长和面积分别是多少？）
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.（一个长方形周长为230厘米，已知它的长是70厘米，它的宽和面积分别是多少？）
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? 一个正方形面积是144平方米，请问它的边长是多少？
Length of each side of the square=12m
500
The area of a square is 64m2. Find its perimeter. 一个正方形的面积为64平方米，请问它的周长是多少。
Length of the side = 8m
Perimeter of this square=8x4=32m