Linear Equations in One Variable — MATHS STD 8 — Question
Gujarat BoardEnglish MediumSTD 8MATHSLinear Equations in One Variable1 Mark
MCQ
What is the length of the rectangle whose breadth is $10\ cm$ and perimeter $60\ cm$
A
$15\ cm$
B
$16\ cm$
✓
$20\ cm$
D
$25\ cm$
✓
Answer
Correct option: C.
$20\ cm$
Breadth of the rectangle $= 10\ cm.$ And Perimeter of the rectangle $= 60\ cm$
Given
We know that,
Perimeter of rectangle $= 2(l+b)$
Substituting the values in the above formula, we get,
$\Rightarrow 60\ cm = 2(l + 10)\ cm$
$\Rightarrow 60\ cm = 2l + 20\ cm$
$\Rightarrow 60 - 20cm = 2l$
$\Rightarrow 40\ cm = 2l$
$\Rightarrow\frac{40}{2}\text{cm} = \text{l}$
$\Rightarrow l = 20\ cm$
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