Question

Two sides of a triangle are 20 cm and 22 cm, semi-perimeter is 36 cm. Find the third side

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Answer 1

Step-by-step explanation:

$we \: know \: that \: \\ semi - perimeter = \frac{a + b + c}{2} \\ 36 = \frac{20 + 22 + c}{2} \\ 72 = 42 + c \\ c = 30$

Answer 2

Two sides of a triangle are 20 cm and 22 cm.

Semi-perimeter is 36 cm means perimeter is 36×2cm = 72cm.

Third side = 72 - (20+22) cm

= 72 - 42 cm

= 30 cm.

OR

Semi−perimeter= 2(a+b+c)

36= 2(20+22+c)

72=42+c

72=42+cc=30

72=42+cc=30

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