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Answers
Explanation:
1)Each side of the Equilateral triangle=10 cm
Perimeter of the equilateral triangle=3×side
=>3×10
=>30 cm
and
If the side of the square is a units then the perimeter of the square=4a units
Given that
Perimeter of the equilateral triangle=Perimeter of the square
=>4a=30
=>a=30/4
=>a=7.5cm
Side of the square=7.5cm
2)Let the breadth be b units
length of the rectangle=(l)=12 cm
Perimeter of the rectangle=2(l+b)
=>2(12+b)=38cm
=>12+b=38/2
=>12+b=19
=>b=19-12
=>b=7cm
Breadth of the rectangle=7cm
Explanation:
side of equilateral Triangle=10 cm
Perimeter =3×10=30 cm
A/Q
Perimeter of Sqare=30cm
but P=4a
so,30cm=4a
30/4=a
=7.5=a
so,side of square =7.5 cm
2)
Let the breadth be b
l=12 cm
Perimeter=38cm
but,P=2(l+b)
38cm=2(12+b)
38/2=12+b
19=12+b
19-12=b
7=b
so,breadth=7cm