Question

8. The perimeter of the triangle given is 48 cm. Two sides of a triangle is 12 cm and 15 cm. What is the measure of the third side?​

Answer 1

Answer:

21 cm

Step-by-step explanation:

Perimeter of triangle =a+b+c

48=12+15+c

48=27+c

48-27=c

21 =c

Answer 2

Answer:

Measure of the third side of triangle is $21\ cm$ .

Step-by-step explanation:

To find :  measure of the third side of triangle .

Given : the perimeter of the triangle is 48 cm. Two sides of a triangle is 12 cm and 15 cm.

Solution :

• As per given data we know that , the perimeter of the triangle is 48 cm. Two sides of a triangle is 12 cm and 15 cm. We have to find measure of the third side of triangle .  
• We know that, perimeter of triangle is sum of three side of triangle.
• If $a,b,c$  are the sides of triangle then,
• Perimeter of triangle $=a+b+c$
• Here , $a = 12\ cm$ , $b =15\ cm$ , $c= ?$  and perimeter = $48\ cm$ .

• Therefore, perimeter of triangle $=12 \mathrm{~cm}+15\mathrm{~cm}+c$

                                                         $48 = 12 + 15 + c \\\\48 = 27 + c \\\\c = 48 - 27\\\\c = 21\ cm$