Question

Two sides of a triangle are 5 cm and 4 cm. Its perimeter is 15 cm; the length of the third side is ————-​

Answer 1

Answer:

two sides of a triangle are 5cm and 4cm

perimeter is 15

find the third side length

5+4+x=15

9+x=15

x=15-9

x=6

therefore third side length is 6

Step-by-step explanation:

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Answer 2

Answer:

6 cm

Step-by-step explanation:

What we know about the perimeter is it is a total of 15 cm and side1=5 cm, side2=4 cm. So we will add the length of side 1 and side 2 5+4=9 and subtract it from the total perimeter of the triangle 15-9=6 to get the length of the third side