Perimeter and area

Question 3

This shape is made with 6 equilateral triangles.

Six equilateral triangles with side length 1 cm arranged in 2 strips of 3 triangles with one overlapping edge.

What is the perimeter of the shape?

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Question 4

A square piece of chocolate has a perimeter of 34 mm. What is the length of each side of the piece of chocolate?

Solution

Perimeter of the square piece of chocolate is 34 mm.

Perimeter of a square = 4 x Length (P = 4 x L)
Therefore 34 = 4 x L
So L = 34 ÷ 4
L = 8.5 mm.

The length of each side of the piece of chocolate is 8.5 mm.