9. 9a) Jadar is buying fencing to fence one side of his garden. He measures the length as 23 cm to the nearest metre. What is the largest possible true length of the garden? (b) One post measures 180 cm truncated to 2 significant figures . ( Truncated means that rather than rounding, any digits after 2 significant figures are simply ignored)
Give the error interval for the height of the post.

ou would have 12 of each

the correct option is 2.

step-by-step explanation:

according to the given information triangle abc is a right angle triangle with right angle at a. segment ab is 5 and segment ac is 7. point d is on segment bc and angles adb and adc are right angles.

it is given that triangles abd, cad, and cba are similar.

two triangles are similar if their corresponding sides are proportional.

in triangle cba, using pythagoras theorem

                      )

triangle abd and cba are similar,

                            (2)

triangle cad and cba are similar,

                      )

using (1), (2) and (3), we get

hence proved.

therefore option 2 is correct.