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Byju's Answer
Standard IV
Mathematics
Perimeter of Irregular Shapes
Find the peri...
Question
Find the perimeter of the given figure having three regular polygon.
A
61 cm
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B
63 cm
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C
70 cm
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D
77 cm
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Solution
The correct option is
C
70 cm
The given figure has 3 polygons.
1. perimeter of polygon containing 5 sides
= number of sides
×
length of one side
= 5
×
7
= 35 cm
2. perimeter of polygon containing 6 sides
= number of sides
×
length of one side
= 6
×
7
= 42 cm
3. perimeter of polygon containing 3 sides
= number of sides
×
length of one side
= 3
×
7
= 21 cm
If you notice they share one side so for the perimeter of the whole figure we need to subtract the length of the common sides side.
perimeter of polygon containing 5 sides
= 35 - 7
= 28 cm
perimeter of polygon containing 6 sides
= 42 - 7 - 7
= 28 cm
perimeter of polygon containing 3 sides
= 21 - 7
= 14 cm
Total perimeter = 28 + 28 + 14
= 70 cm
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