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Answer 1

Answer:

hope this helps

Step-by-step explanation:

by Pythagoras theorem, AB² = AC² + BC²

13² = 12² + BC²

BC² = 13²- 12²

       = 169 - 144

       = 25

BC = √25

     = 5 cm

therefore area of triangle ABC = 1/2 * base AC * height BC

                                                   = 1/2 * 12 * 5

                                                   = 6 * 5 = 30cm

if we rotate the triangle, we can see that area = 1/2 * base x * height AB

30 = 1/2 * x * 13

x = 30*2 / 13

  = 60/13

  = 4.615 cm or 4.62 cm

so ur answer is d)