Question

5. Find the area of 4 walls of a hall whose dimensions are 12m,8m and 10m
5. Total surface area of a cube is 726cm? Find its side.​

Answer 1

Answer:

5- a)-592cm.sq.

5- b)-

Step-by-step explanation:

5-a)-Areas of 4 walls of a hall=Curved surface area of the hall

=2×(lb+lh+bh)cm.sq.

=2×[(12×8)+(12×10)+(8×10)]cm.sq.

=2×(96+120+80)cm.sq.

=2×296cm.sq.

=592cm.sq.

5-b)- Let the side of the cube be x

Since, Total surface area of cube= 6×side^2

or,. 726cm.=6× x^2

726/6=x^2

121=x^2

11=x

The length of the side of the cube is 11 cm.