Question

find the curved surface area of cube whose Total surface area is given (a) 486 (b) 150

please answer fast​

Answer 1

Case 1 :

→ T.S.A of cube = 486

→ 6a² = 486

→ a² = 486 / 6

→ a² = 81

→ a = √81

→ a = 9

Now

C.S.A of the cube = 4a²

→ 4 × 9²

→ 4 × 81

→ 324 unit²

Case 2 :-

→ T.S.A of cube = 150

→ 6a² = 150

→ a² = 150 / 6

→ a² = 25

→ a = √25

→ a = 5

Now

C.S.A of the cube = 4a²

→ 4 × 5²

→ 4 × 25

→ 100 unit²

Curved surface area of the cubes are 324 unit² amd 100 unit²

Answer 2

CSA of cube=4a².

TSA of cube=6a²

(1).486/6=a²

✓81=9=a.

LSA=4(9)²=4(81)=324.

(2). 150/6=a²

✓25=5=a

LSA=4(5)²=4(25)=100.