Question

Two sides of a triangle are 15 cm and 20 cm . The perimeter of the triangle is 52 cm. Length of the third side is :​

Answer 1

Answer:

Let the length be l

Perimeter=A+B+C. SIDES OF TRIANGLE

52CM=15+20+l

52CM=35+l

l=52CM-35CM

l=17CM

Step-by-step explanation:

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Answer 2

Answer:

perimeter of triangle is equal to sum of its three sides

here two sides are given we have to find third size and perimeter is also given which is 52 cm

let third side be = x cm

ACCORDING TO QUESTION

15+20+x= 52

35+x=52

x= 52-35

x= 17cm

so third will be 17 cm long