Question

Stephanie just redecorated her bedroom. She wants to paint her door green but needs to know the surface area of the door to see if she has enough paint. What is the surface area of the door? If the height is 200cm, the length is 3cm and the width is 80cm

Answer 1

Answer:

33,680 cm ²

Explanation:

The surface area of a door takes a cuboidal shape, so we will be determining the surface area of a cuboid by using the relation:

$\mathbf{S.A = 2(l*w)+2(1*h)+2(w*h)}$

Given that;

the height of the door = 200 cm

the length of the door = 3 cm

the width of the door = 80 cm

Then; using the above formula; the Surface area  S.A of the door is as follows:

$\mathbf{S.A = 2(3*80)+2(3*200)+2(80*200)} \\ \\ \mathbf{S.A = 2(240)+2(600)+2(16000)}$

$\mathbf{S.A = 480+1200+32000} \\ \\ \mathbf{S.A = 33,680 \ cm^2}$