Volumes Practice Test 4

Here, length of the cuboid = Edge of the first cube + Edge of the second cube = 10 + 10 = 20 cm
∴ Surface area of the cuboid = 2(20 × 10 + 10 × 10 + 10 × 20)
= 2(200 + 100 + 200)
= 2 × 500 = 1000 sq. cm.