Question

B.
Find its perin
5. Find the perimeters of (1) AABE (ii) the rectangle BCDE in this
figure. Whose perimeter is greater?
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زر
6
frame Thenicture is 7
cm wide​

Answer 1

Answer.

MATHS

Find the perimeters of

(i) △ABE

(ii) the rectangle BCED in this figure, Whose perimeter is greater?

question

ANSWER

Given AB=

2

5

cm,BE=

4

11

cm,AE=

5

18

cm,DE=

6

7

cm

(i) perimeter of ΔABE=AB+BE+AE

=

2

5

+

4

11

+

5

18

LCM(2,4,5)=20=

20

5×10+11×5+18

=

20

50+55+18

=

20

123

= 6.15 cm

(ii) Perimeter of rectangle BCED

= 2(BC+CD)

=2(BC+CD)

= BC+CD+DE+EB

= DE+BE+DE+BE

Since opposite sides are equal

= 2(DE+BE)

=2(

6

7

+

4

11

)

=

24

2

(28+66)

=

12

1

×94=

12

94

=7.833

= 7.833 cm

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