Hi,

The perimeter of a triangle is 90 cm

The lengths of the sides of the triangle are in the ratios 3 : 5 : 7 

 3k + 5k + 7k = 90cm     | Letting k be the constant of the proportion

         15k = 90cm

           k = 6cm

 , the longest side

and...

  

RELATED QUESTIONS

please help me

Triangle ABC has a perimeter of 84cm, and the sides have a ratio of 3 :  (answered by ewatrrr)

The sides of a triangle are in the ratio 3 : 4 : 5. What is the length of each side if... (answered by sachi)

The lengths of three sides of a triangle are in the ratio 3:5:6.  The perimeter of the... (answered by rahman)

what are the ratios of the sides in a 45-45-90 triangle.
 (answered by solver91311)

The lengths of the sides of a triangle are in the extended ratio 7​:8​:10.... (answered by Collinwilfixyouuprealnice)

The lengths of the sides of a triangle are in the extended ratio 4 ​: 7 ​: 9.  (answered by josgarithmetic)

The sides of a triangle are in the ratio 12:13:14. The perimeter is 156 cm. Find the... (answered by jim_thompson5910)

the sides of a triangle are in the proportion 2:3:7. the longest side of the triangle is... (answered by stanbon)

the measure of the legs of a right triangle are in the ratios 3:4. If the area of the... (answered by TimothyLamb)