Question

3
(iv) R P(A)=
4
n(A) = 39, Rn(S) =?​

Answer 1

Answer:

Answer:

Length of bases are 15 cm and 21 cm.

Step-by-step explanation:

To find :-

Length of bases.

Solution :-

Given that,

Area of trapezium is 126 cm².

Height of trapezium is 7 cm.

Let, Other base be x cm.

And One base be x + 6 cm.

If the height 7 cm have two bases and height is of trapezium then the x and x + 6 are parallel sides of trapezium.

We know,

Area of trapezium = (a + b)/2 × h

Put area, height and bases (parallel sides) of trapezium in formula :

$\longrightarrow$ 126 = (x + x + 6)/2 × 7

$\longrightarrow$ 126 × 2 = 2x + 6 × 7

$\longrightarrow$ 252 = 2x + 6 × 7

$\longrightarrow$ 252/7 = 2x + 6

$\longrightarrow$ 36 = 2x + 6

$\longrightarrow$ 36 - 6 = 2x

$\longrightarrow$ 30 = 2x

$\longrightarrow$ 30/2 = x

$\longrightarrow$ x = 15

Length of bases :-

One base = x + 6 = 15 + 6 = 21 cm

Other base = x = 15 cm

Answer 2

Answer:

9.75

Step-by-step explanation:

Given,

P ( A ) = 4

n ( A ) = 39

To find : -

n ( S ) = ?

Formula : -

P ( A ) = n ( A ) / n ( S )

n ( S ) = n ( A ) / P ( A )

         = 39 / 4

n ( S ) = 9.75