Perimeter - Problems with Solutions

By Catalin David
Problem 1
What is the perimeter of triangle ABC?


Problem 2
The red triangle is equilateral with a side of 23 centimetres.
Its perimeter is cm.


Problem 3
An isosceles triangle has a perimetеr of 37 centimetres and its base has a length of 9 centimetres. Each of the other two sides has a length of cm.
Problem 4
Tim's garden is shaped like a square whose side is 9 meters. What's the length of the fence which surrounds the garden?
Answer: meters.
Problem 5
In rectangle ABCD the red side is 18 cm and the blue side is 12 cm. The perimeter is cm.


Problem 6
A rectangle has a length of 28 cm and a width smaller by 6 cm. Its perimeter is cm.
Problem 7
A rectangle has a width of 19 cm and a length three times greater than its width. Its perimeter is cm.
Problem 8
The width and length of a rectangle are two consecutive numbers. If the perimeter is 30 cm, then its width is cm.
Problem 9
John builds a square with a side of 12 cm from some wire. If from the same wire, he builds a rectangle with a width of 6 cm, what is the length of the rectangle?
Problem 10
A park shaped like a rectangle has a length of 24 meters and a width of 18 meters. If trees are planted on its sides with gaps of 2 meters between them, how many trees are needed?



Problem 11
What is the perimeter of the blue figure?


Problem 12
What is the perimeter of the red figure?


Problem 13
Can we built a triangle in which a side is half the perimeter?
Problem 14
The square in the figure has a perimeter of 24 cm. The blue triangle has a perimeter of 15 cm. What is the perimeter of the red figure?


Problem 15
Rectangle ABCD has a perimeter of 24 cm and diagonal has a length of 8 cm. What is the perimeter of the green triangle?


Problem 16
The red figures are two triangles, each having a perimeter of 47 cm. The blue figure is a square. What is the distance covered by an ant on the path A-B-C-D-E-F-A?


Problem 17
What is the perimeter of the figure displayed in the image?


Problem 18
What is the perimetеr of the green zone if the blue zone has a width of 3 metres?


Problem 19
The blue square has a perimetеr of 16 cm. The red triangles are equilateral. What distance is covered by a snail following path ABCDFGHA?


Problem 20
The green squares each have a perimetеr of 12 cm. What is the perimetеr of the big square?


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