Question

Two side of a triangle are 21 cm and 32 CM. The perimeter of the triangle is 85 CM. Find the third side

Answer 1

Given:

sides of triangle: 21cm and 32cm

perimeter of triangle: 85cm

What to find:

third side

solution:

let the third side be x

Perimeter = sum of all sides

= 21 + 32 + x

= 53 + x

85 = 53 + x

85-53 = x

x = 32cm

Verification:

21 + 32 + 32= 85cm

Hence the answer is verified!

the third side is 32cm

Answer 2

Answer:

The third side of triangle is 32cm

Step-by-step explanation:

Question:-

Two side of a triangle are 21 cm and 32 CM. The perimeter of the triangle is 85 CM. Find the third side

Given:-

Two side of triangle are 21cm and 32cm and perimeter of 85cm

To find:-

The third side

Solution:-

Let us assume that,

Side a=21cm

Side b=32cm

Side c=x cm

As we know

Perimeter of triangle=Sum of all sides

85cm=21cm+32cm+ x

We already know the perimeter of triangle so that we are substituting

On substituting the given values we get,

$\mapsto \: 85cm = 53cm + x$

$\mapsto \: 85cm - 53cm = x$

$32cm = x$

Therefore the third side is 32cm

Additional information:-

$\small\mathfrak\red{More \: formulas}$

Perimeter of rectangle=2(length+breadth)

Perimeter of square=4×side

Perimeter of triangle=Sum of all sides

Perimeter of equilateral triangle=3×side

Perimeter of trapezium=a(base) +b(base) +c(height) +d(height)

Perimeter of parallelogram=2(base+height)

Perimeter of circle=

$2\pi \: r$

Perimeter of semicircle=

$\frac{2\pi \: r}{2} + d$

or,

$\pi \: r + d$

R=radius

d=diameter

Perimeter of rhombus=4×side