Question

please solve this 1&2 question
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Answer 1

Answer:

Step-by-step explanation:

1. lsa of cuboid = 2(lb + bh+hl)

                        = 2(20.10 + 10.40 +40.20)

                          2×1400=2800

2. l²=h² +  r²

   r=√l² - h²

    r =√ 13² - 5²

     r =√ 144 = 12 cm