Answer:
Explanation:
(the small double lines like = means that the length of those sides are all same)
So, if one length is considered as x
the other two will also be x
we see that the length of one side is given which is 27
to find x
x + x + x = 27
3x = 27
so, x = 27/3
x = 9m
(the small vertical single line means that those sides are equal)
so if one side is y, the other two are also y
so , y + y+ y = 30
3y = 30
y = 10m
If we imagine the stairs to be made of small rectangles of length 10m and base 9m , finding area will be easier.
we will see that there are 9 rectangles in total
area of rectangle = length x base
so, area of 1 rectangle = 9x10
= 90
so area of 9 identical rectangles = 9 x 90
= 810