Question

What is the length of the third side of a triangle if one side measures 10 cm, the second measures 15 cm and the perimeter is 45 cm.

Answer 1

Answer:

20 cm

Step-by-step explanation:

Given:

perimeter = 45 cm

side1 length = 10cm

side2 length = 15cm

side3 length = 'x'cm

perimeter = s1 + s2 + s3

45 = 10 + 15 + x

  x = 45 - (10 + 15)

  x = 45 - 25

  x = 20 cm