Question

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Answer 1

Answer:

8) area of triangle = 1/2 x b x h

30 = 1/2 x b x 6

b = 30 x 2 / 6

b = 60/6

b = 10 cm

9) area of triangle = 1/2 x b x h

96 = 1/2 x 2 x h

h = 96cm

10) area of square = S²

= (40)² = 1600 m²

cost of fencing = 1600 x 85

= rs. 136000

11) area of rectangular wall = l x b

for 2 walls of l = 4 m and b = 3.5 m

= 2 ( 4 x 3.5 )

= 2 x 14 = 28 m²

for the other 2 walls with l = 3.5 m and b = 3m

= 2(3.5 x 3)

= 2 x 10.5 = 22m²

adding areas of four walls = 28 + 22 = 50m²

cost = 50 x 55 = rs. 2750

13) perimeter of square = 4xS

400 m = 4 x S

S = 100 m

now , area of square = S²

= (100)² = 10000 m²

14) a) length of wire = 16m

b) area of square = 20² = 400 m²

c) area of rectangle = l x b

= 16 x 20 = 320 m²

Step-by-step explanation:

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