Lesson Worksheet: Equilateral Triangles Mathematics • 11th Grade

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In this worksheet, we will practice identifying equilateral triangles by their equal side lengths or equal angle measures to find a missing side length, perimeter, or area.

Q1:

Find the perimeter of the shape below.

Q2:

One side of an equaliteral triangle has length . Another side has length . Find the perimeter of the triangle.

Q3:

The perimeter of an equilateral triangle is equal to the perimeter of a rectangle with a length of 5 cm and a width of 4 cm. Find the length of one side of the triangle.

Q4:

Find the perimeter of .

Q5:

In the figure below, is an equilateral triangle, , and . Find .

Q6:

The area of an equilateral triangle is cm². Find the side length.

Q7:

The diagram shows an equilateral triangle. Find the length of its sides.

Q8:

What is the ratio of the length of a side of an equilateral triangle to its perimeter?

Q9:

A triangle has three sides equal in length and a perimeter of 24 length units. Find the length of one of its sides.

Q10:

Calculate the length of one of the sides of an equilateral triangle which has a perimeter of 93 m.

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