Question

Two sides of a triangle are 15 cm and 18 cm The perimeter of the triangle is 45 cm. What is its third side?​

Answer 1

Answer:

12cm

Step-by-step explanation:

we know sum of all side = perimeter

so, let third side be x

then,

$15 + 18 + x = 45 \\ 33 + x = 45 \\ x = 45 - 33 \\ x = 12$

Answer 2

Hope the answer helps you...