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$\frac{1}{2}$ (sum of parallel sides) $\times$ altitude is the formula of

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Formula of area of trapezium

Formula of perimeter of rectangle

Formula of the rhombus

Formula of area of square

answer is A.

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Detailed Solution

We have to find for what the formula

\frac{1}{2}

(sum of parallel sides)

\times

altitude.
is used.
Consider option 1,
We know, area of trapezium

= \frac{1}{2} \times

(Sum of parallel sides)

\times

(altitude)
Thus option 1 is correct.
Consider option 2,
Perimeter of rectangle,P=2(l+w),
Where l = length of rectangle
W = width of rectangle
So, option 2 is not correct.
Consider option 3,
Formula of the rhombus, A=

\frac{p \times q}{2}

Where p and q are diagonals of rhombus.
So, option 3 is not correct.
Consider option 4,
Formula of area of square is,
A =

a^{2}

, where a is the side of the square.
So, option 4 is also not correct.
Therefore,

\frac{1}{2}

(sum of parallel sides)

\times

altitude is the formula of area of trapezium.
Hence, option 1 is correct.

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