Question

21
The perimeter of a triangle is 36
cm. Its two sides are 10 cm and 12
cm. The length of the third side is-
14cm
16cm
ОООО
15cm
18cm​

Answer 1

Answer:

perimeter = 36 cm

one side = 10 cm

second side = 12 cm

let the third side be x

perimeter of triangle = sum of all sides of triangle

36 cm = 10 cm + 12 cm + x

36 cm = 22 cm + x

36 - 22 cm = x

14 cm = x

Answer = the third side of the triangle is 14 cm

Step-by-step explanation:

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Answer 2

Answer:

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Step-by-step explanation:

Perimeter = Side + Side + Side             Let third side be s3

Given, Perimeter = p = 36cm

Two sides = s1,s2 = 10cm,12cm

Hence,

36 = 10+12+s3;   36 = 22+s3

s3 = 36-22=14cm

Third side = s3 = 14cm

Proof:

36=14+10+12 ; 36=36(proofed)