Question

look at the given picture and find the area of the shaded portion.Find also cost of tge polishing the unshaded portion at the rate of ₹15 per square metre​

Answer 1

Answer:

Area of shaded Portion :- 270 Sq.m

Cost of polishing shaded portion :- ₹28200

Step-by-step explanation:

If we observe Carefully, we can observe two rectangles.

Firstly, we have dimensions of bigger rectangle.

i.e 50 ×43

Let's find area of bigger triangle

Area of rectangle = L × B

= 50 × 43

= 2150 sq.m

Let's find dimensions of smaller rectangle. So here if we observe Carefully,

l = 50 - 3 = 47

B = 43 - (1+2) = 43 - 3 = 40

Hence, dimensions of new rectangle are 47×40.

Area of rectangle = L × B

= 47× 40

= 1880 Sq.m

Now, just substract Area of bigger rectangle with area of smaller rectangle.

Area of shaded region = Area of Bigger rectangle- Area of smaller rectangle

= 2150 - 1880

= 270 sq.m

Here Area of smaller rectangle = Area of Unshaded region

Therefore, Area of Unshaded region = 1880 sq.m

Since rate of polishing unshaded region is ₹15 per square metre.

Therfore, Total cost of polishing = 1880 × 15

unshaded region = ₹ 28,200

Answer 2

Step-by-step explanation:

for find area of this figure

we minimize area of short figure into whole figure

in the end we multiply find area with cost of 1 m² area

= 270 m² ×15₹/m²

= 4050₹