Calculate the surface area of this cuboid. 

There are two ways of solving this problem. 

Method 1: 

By calculating the area of each rectangular face:

As the front is the same as the back, the top the same as the bottom and the two sides equal to each other, the area can be worked out in pairs.

Area of front and back =6×5×2=60cm² 

Area of top and bottom=6×3×2=36cm² 

Area of both sides=3×5×2=30 cm² 

Total surface area =60+36+30=126 cm² 

Method 2:

By calculating the area of the net of the cuboid. 

The net of a cuboid is the two-dimensional shape which, when folded up, forms the cuboid. 

For example:

Area of large rectangle A=6× 16=96 cm² 

Area of rectangle B=5×3=15cm² 

Area of rectangle C=5×3=15cm² 

Therefore total surface area=96+15+15=126 cm²

Transcribed Image Text:

6cm 5 cm 3 cm