Question

match blank only 3 question std 9​

Answer 1

Step-by-step explanation:

semi perimeter of a triangle = 10 cms

perimeter of the triangle = (2×10) cms

= 20 cms

Let the third side of the triangle be x

5 + 7 + x = 20

12 + x = 20

x = 20 - 12

x = 8 cms

hence, the third side is of 8 cms

Answer 2

Answer:

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