Two sides of a triangle are 5 cm and 4 cm. The perimeter of the triangle is 12 cm. The length of the third side is
21 cm
9 cm
3 cm
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Two sides of a triangle are 5 cm and 4 cm. The perimeter of the triangle is 12 cm. The length of the third side is
21 cm
9 cm
3 cm
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Verified answer
Answer:
3cm
Step-by-step explanation:
Given,
To find,
Options Given,
The perimeter of a triangle = 1st side + 2nd side + 3rd side
⇒12cm = 5cm + 4cm + 3rd side
⇒12cm = 9cm + 3rd side
⇒12cm - 9cm = 3rd side [Transposition]
⇒3cm = 3rd side
.°. The length of 3rd side is 3cm.
Hence, The last option 3cm is the right answer.