Mensuration Test

Result

Mensuration Test - 6

Score
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Rank
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Weekly Quiz Competition

Question 1
1 / -0

If two cubes of sides 9 cm each are joined end by end then the surface area of cuboid will

A
800 cm²

B
810 cm²

C
820 cm²

D
830 cm²

Solution

(b): As we know, surface area =6a² Two cubes joined ⇒Total surface area =2 × 6a²− surface area of two cubes at joints ⇒ 12a² − 2 × a² =10a² = 10 × 9² = 810.
Question 2
1 / -0

Find the surface area of a cuboid whose dimensions are 25m, 10m and 2m.

A
610 m²

B
640 m²

C
650 m²

D
620 m²

Solution

(b): surface area = 2(lb + bh + lh) =2(25 × 10 + 10 × 2 + 25 × 2) = 2 (250 + 20 + 50) = 640