Question

3.Two cubes each of volume 64cm are joined end to end. Find the surface area of resulting cuboid.
Cind the area afamadront of a circle whose circumference is 22cm​

Answer 1

Answer:

1. 160 cm ^2
2. 38.5 cm ^2

Step-by-step explanation:

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Answer 2

Answer:

Step-by-step explanation:

1) Volume of cube = ³

64 = a³

a = 4

Now l= 8 cm

        b= 4 cm

        h= 4 cm

∴ Surface area of a cuboid = 2(lb + bh +hl)

                                             = 2(32 + 16 + 32)

                                              = 2×80

                                              = 160 cm²

2) Circumference = 2πr

 22 = 2πr

  r = 7/2 cm

∴ area of quadrant = 90/360 × πr²

                               = 1/4 × 22/7 × 7/2 ×7/2

                               = 77/8 cm²

                               = 9.625 cm²