Question

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Answer 1

8) perimeter of triangle = 32 cm

and also we know that ,

perimeter of triangle = side¹ + side² + side³

32 = 12 + 13 + side³

32 = 25 + side³

32 - 25 = side³

7 = side³

so answer : the third side of triangle = 7 cm

I hope this will be help you

Answer 2

Answer:

8. Perimeter of a triangle = 32cm

Two sides of a triangle = 12cm, 13cm

Third side = 32-25 = 7cm.

9. a) 15:45::40:120

15x120 = 45x40 (product of extremes = product of means)

1800 = 1800

Therefore, 15,45,40,120 are in proportion.

b) 33:121:9::96

33x96 = 121x9

3168 ≠ 1089

Therefore, 33,121,9,96 are not in proportion.

Hope this helps you