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Question
Show that the points (2, 0), (–2, 0), and (0, 2) are the vertices of a triangle. Also, a state with the reason for the type of triangle.
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Solution
A ≡ (2, 0) ≡ (x1, y1)
B ≡ (–2 , 0) ≡ (x2, y2)
C ≡ (0, 2) ≡ (x3, y3)
∴ ABC form a triangle.
AB = `sqrt ((x_2 - x_1)^2 + ("y"_2 - "y"_1)^2)`
= `sqrt ((-2-2)^2 + (0 - 0)^2)`
= `sqrt ((-4)^2 + 0)`
= `sqrt(16)`
= 4 units
AC = `sqrt ((x_3 - x_1)^2 + ("y"_3 - "y"_1)^2)`
= `sqrt ((0-2)^2 + (2 - 0)^2)`
= `sqrt ((-2)^2 + (2)^2)`
= `sqrt (4 + 4)`
= `sqrt(8)`
= `2sqrt(2)` units
BC = `sqrt ((x_3 - x_2)^2 + ("y"_3 - "y"_2)^2)`
= `sqrt ((0-(-2)^2) + (2 - 0)^2)`
= `sqrt ((0 + 2)^2 + (2 - 0)^2)`
= `sqrt ((2)^2 + (2)^2)`
= `sqrt(8)`
= `2sqrt(2)` units
So, if side AC and side BC are equal then the triangle is an isosceles triangle.
AB2 = BC2 + AC2
`(4)^2 = (2sqrt2)^2 + (2sqrt(2))^2`
16 = 8 + 8
16 = 16
So, it is a right-angle isosceles triangle.
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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:
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 ______.
Case Study -2
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- 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:
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Use of mobile screen for long hours makes your eye sight weak and give you headaches. Children who are addicted to play "PUBG" can get easily stressed out. To raise social awareness about ill effects of playing PUBG, a school decided to start 'BAN PUBG' campaign, in which students are asked to prepare campaign board in the shape of a rectangle: One such campaign board made by class X student of the school is shown in the figure.
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Based on the above information, answer the following questions:
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OR - Find the ratio of the length of side AB to the length of the diagonal AC.
- Find the area of the campaign Board ABCD.
