If the 'tread' of each step is a cm, and...

If the 'tread' of each step is a cm, and there are n steps, make a formula for the length (d cm) of AB.

A

`d=(1)/(2)na`

B

`d=na`

C

`d=3na`

D

`d=na^(2)`

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The correct Answer is:

B

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Knowledge Check

Figureshows a number of equal steps. If the 'rise' of each step is h cm, are there are n steps, make a formula for the height (H) in centrimeters of the steps.

A

`H=(1)/(2)nH`

B

`H=2nh`

C

`H=nh`

D

`H=n^(2)h`

AB is a tangent to a circle with centre O. If the radius at the circle is 7 cm and the length of AB is 24 cm, then what is the length (in cm) of OA?

A

25

B

26

C

28

D

31

Ashoke and Ravi stood before a plane mirror at a distance of 3 m from it. Ashok walked 5 steps towards the mirror, each step measuring 30 cm. Ravi walked 8 steps away from the mirror, each step measuring 25 cm. The distance between Ravi and the image of Ashoke in the mirror is ______ m.

A

5.5 m

B

4.5 m

C

7.5 m

D

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S CHAND IIT JEE FOUNDATION-ALGEBRAIC EXPRESSIONS -SELF ASSESSMENT SHEET-7

If the 'tread' of each step is a cm, and there are n steps, make a for...
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