classroom is 7 metre long and 6.5 white and 4 metre high it has one door 3 metre multiply one metre and three Windows each measuring 2 metre into one the interior walls are to be colour washed find area of walls to be colour washed

The area of the walls to be color washed is 190 square meters

Step-by-step explanation:

Firstly, we calculate the area of the room it self

The room is cuboidal in shape given its measurement

So the area is 2(lb + lh + bh)

That will be ;

2(7(6.5) + 6.5(4) + 7(4))

= 2(45.5 + 26 + 28)

= 2(99.5) = 199 square meters

Now, the area of the walls is the total room area minus the area of the windows and doors

Area of the door is = 3 * 1 = 3 square meters

Area of 1 window is 2 * 1 = 2 square meters

Area of the 3 windows is 3 * 2 square meters = 6 square meters

We add this to the area of the door

That will be 6 + 3 = 9 square meters

So the area of the wall to be color washed will be

199 square meters - 9 square meters = 190 square meters

the correct answer is option c.   3

step-by-step explanation:

points to remember

equation of the line with coordinates (x₁, y₁) and (x₂, y₂) is given by,

slope m = (y₂ - y₁)/(x₂ - x₁)

from the figure we can see a line with two coordinates given

to find the slope of given line

here   (x₁, y₁)   = (-1, -1 ) and (x₂, y₂) = (1, 5)

slope m = (y₂ - y₁)/(x₂ - x₁)

  = (5 - -1)/(1 - -1)

  = (5 + 1)/(1 + 1)

  = 6/2 = 3

therefore the correct answer is option c.   3