Question

12. Find the perimeter of each figure: 10.5 m 0.7 m 21 m 0.7 m ա է O O 21 m (a) (b) (c) Fig. 15.7​

Answer 1

Step-by-step explanation:

Perimeter of figure = sum of all sides

1. therefore,Perimeter of 1 figure= Sum of all sides

= 10.5+7+7

= 24.5 cm

• Perimeter of 2 figure= Sum of all sides

= 21+21

= 42 cm

• Perimeter of 3 figure = Sum of all sides

= 0.7+0.7

= 1.4 cm

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Answer 2

Answer:-

(a)51.485 m

(b)73.97 m

(c)1.897 m

Step by step explanation:-

(a)

Perimeter of triangle = sum of all the sides

=> 7+7+10.5

=> 24.5 m

perimeter of a semicircle = πr+2r

=> 3.14 × 5.25 + 2 × 5.25

=> 16.485 + 10.5

=> 26.985 m

Perimeter of the whole figure = perimeter of triangle + perimeter of semicircle

=> 24.5 + 26.985

=> 51.485 m

(b)

perimeter of quatercircle= 2r+πr/2

=> 2×21+3.14×21/2

=> 41 + 65.94/2

=> 41 + 32.97

=> 73.97 m

(c)

perimeter of circle => 2πr

=> 2×3.14×0.7

=> 4.396 m

perimeter of quatercircle= 2r+πr/2

=> 2×0.7+3.14×0.7/2

=> 1.4+2.198/2

=> 1.4+1.099

=> 2.499 m

Perimeter of figure= perimeter of circle - perimeter of quatercircle

=> 4.396 m - 2.499 m

=> 1.897 m

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