two sides of triangle measure 7 cm and 5 cm . find the length of the third side of the perimeter of the triangle is 20
Answers
Answered by
1
Answer:
8 cm.
Step-by-step explanation:
Perimeter of a Δ = 3 × side or side + side + side
Given: two sides of the Δ of measures 7 cm and 5 cm respectively.
Let the required number be x.
Then, (7 + 5 + x) cm = 20 cm
⇒ x = 20 - 12
⇒ x = 8
And, (7 + 5 + 8) cm = 20 cm
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Answered by
0
Answer:
8cm
Step-by-step explanation:
Length of 1st side = 7cm
Length of 2nd side = 5cm
Let us assume the length of 3rd side be 'x' cm
= Perimeter of triangle = Side + side + side
20 = 7 + 5 + x
20 - 12 = x
8 = x
Length of 3rd side = 8cm
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