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Question
Ayush starts walking from his house to office. Instead of going to the office directly, he goes to a bank first, from there to his daughter’s school and then reaches the office. What is the extra distance travelled by Ayush in reaching his office? (Assume that all distances covered are in straight lines). If the house is situated at (2, 4), bank at (5, 8), school at (13, 14) and office at (13, 26) and coordinates are in km.
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Solution
By given condition, we drawn a figure in which every place are indicated with his coordinates and direction also.
We know that,
Distance between two points (x1, y1) and (x2, y2),
d = `sqrt((x_2 - x_1)^2 + (y_2 - y_1)^2`
Now, distance between house and bank
= `sqrt((5 - 2)^2 + (8 - 4)^2`
= `sqrt((3)^2 + (4)^2`
= `sqrt(9 + 16)`
= `sqrt(25)`
= 5
Distance between bank and daughter's school
= `sqrt((13 - 5)^2 + (14 - 8)^2`
= `sqrt((8)^2 + (6)^2`
= `sqrt(64 + 36)`
= `sqrt(100)`
= 10
Distance between daughter's school and office
= `sqrt((13 - 13)^2 + (26 - 14)^2`
= `sqrt(0 + (12)^2`
= 12
Total distance (House + Bank + School + Office) travelled
= 5 + 10 + 12
= 27 units
Distance between house to offices
= `sqrt((13 - 2)^2 + (26 - 4)^2`
= `sqrt((11)^2 + (22)^2`
= `sqrt(121 + 484)`
= `sqrt(605)`
= 24.59
= 24.6 km
So, extra distance travelled by Ayush in reaching his office = 27 – 24.6 = 2.4 km.
Hence, the required extra distance travelled by Ayush is 2.4 km.
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Case Study -2
A hockey field is the playing surface for the game of hockey. Historically, the game was played on natural turf (grass) but nowadays it is predominantly played on an artificial turf.
It is rectangular in shape - 100 yards by 60 yards. Goals consist of two upright posts placed equidistant from the centre of the backline, joined at the top by a horizontal crossbar. The inner edges of the posts must be 3.66 metres (4 yards) apart, and the lower edge of the crossbar must be 2.14 metres (7 feet) above the ground.
Each team plays with 11 players on the field during the game including the goalie. Positions you might play include -
- Forward: As shown by players A, B, C and D.
- Midfielders: As shown by players E, F and G.
- Fullbacks: As shown by players H, I and J.
- Goalie: As shown by player K.
Using the picture of a hockey field below, answer the questions that follow:
The coordinates of the centroid of ΔEHJ are ______.
Case Study -2
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It is rectangular in shape - 100 yards by 60 yards. Goals consist of two upright posts placed equidistant from the centre of the backline, joined at the top by a horizontal crossbar. The inner edges of the posts must be 3.66 metres (4 yards) apart, and the lower edge of the crossbar must be 2.14 metres (7 feet) above the ground.
Each team plays with 11 players on the field during the game including the goalie. Positions you might play include -
- Forward: As shown by players A, B, C and D.
- Midfielders: As shown by players E, F and G.
- Fullbacks: As shown by players H, I and J.
- Goalie: As shown by player K.
Using the picture of a hockey field below, answer the questions that follow:
If a player P needs to be at equal distances from A and G, such that A, P and G are in straight line, then position of P will be given by ______.
Find the points on the x-axis which are at a distance of `2sqrt(5)` from the point (7, – 4). How many such points are there?
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