Question

An length of the side of an equilateral triangle is “d+5”. Te triangle has a perimeter of 45cm. Write and solve an equation to help you find the length of each side of the equilateral triangle.

Answer 1

Answer:

side = 15 cm

Step-by-step explanation:

let a = side if the equilateral triangle

perimeter of equilateral triangle =

3a = 45 (given )

3(d+5) = 45

3d + 15 = 45

3d = 45-15

3d = 30

d = 30/3

d = 10

side = d+ 5

10+5

Ans = 15cm

Answer 2

Step-by-step explanation:

Given,

Perimeter of Equilateral triangle= 45cm

side of Equilateral triangle= ( d+5)

Perimeter of Equilateral triangle (formula)

= 3a

now arranging all the information

$3a = 45 \\ putting \: side \\ 3 \times (d + 5) = 45 \\ 3d + 15 = 45 \\ 3d = 45 - 15 \\ 3d = 30 \\ d = \frac{30}{3} \\ = d = 10 \\ \\ therefore \: the \: side \: of \: equilateral \: triangle \\ d + 5 \\ putting \: d \\ = 10 + 5cm \\ = 15cm$