Question

the samipreimeter of a triangle is 20 cm and the langhth

of its two sides is 12 cm each . what is the length of its ramaining ?​

Answer 1

Answer:

➡Third side of the triangle = 16 cm

Step-by-step explanation:

⚫Given :

➡First side = 12 cm

➡Second side = 12 cm

➡Semi perimeter of the triangle = 20 cm

⚫To find :

➡The third side of the triangle

⚫Taken :

➡Let the third side be x

➡So , to find the third side use this formula -:

$➡s = \frac{a +b + c }{2}$

Where,

➡s = Semi-perimeter

➡a = First side

➡b = Second side

➡c = Third side

⚫Solution :

$⟹20 = \frac{12 + 12 + x}{2} \\ \\ ⟹20 = \frac{24 + x}{2}$

➡Cross multiply the number

$⟹20 \times 2 = 24 + x \\⟹40 = 24 +x \\ ⟹40 - 24 = x \\ ⟹16cm = x$

➡So , the third side of the triangle is 16 cm .

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