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# LINES AND PLANES IN THREE DIMENSIONS

## Presentation on theme: "LINES AND PLANES IN THREE DIMENSIONS"— Presentation transcript:

LINES AND PLANES IN THREE DIMENSIONS
OLEH PN. CHUANG BEE ENG SM TEKNIK BATU PAHAT

LINES AND PLANES IN 3-DIMENSION
To answer the question from this topic, the students must acquire the following skills : Able to identify the angle between a line and a plane ( 1 Mark ) Able to calculate the angle between a line and a plane ( 3 Marks ). Able to identify the angle between two planes ( 1 Mark ). Able to calculate the angle between two planes ( 3 Marks )

EXAMPLE : Diagram shows a cuboid with a horizontal rectangular base. Calculate the angle between the planeTWR and the plane PSWT. W P V T U 8cm 5cm S R Q P1 Tan RWS =  RWS = Tan -1 =  K2 N1 SOLUTION : R T / W S At the back W S R 8cm 5cm

ACTIVITY 1 : TO IDENTIFY THE PLANE
G E F D C A B PLANE AT THE TOP : PLANE EFGH

H G E F D C A B PLANE ON THE LEFT : PLANE ADHE

H G E F D C A B PLANE IN THE FRONT : PLANE ABFE

H G E F D C A B PLANE AT THE BACK : PLANE DCGH

H G E F D C A B PLANE AT THE BOTTOM: PLANE ABCD

H G E F D C A B PLANE ON THE RIGHT : PLANE BCGF

THE LOCATION OF THE POINT
ON TOP OF THE RED DOT TO THE RIGHT OF THE RED DOT AT THE BACK OF THE RED DOT IN FRONT OF THE RED DOT

ON THE TOP OF …. AT THE BACK OF …. TO THE LEFT OF …. TO THE RIGHT OF …. IN FRONT OF …. AT THE BOTTOM OF ….

ACTIVITY 2 : TO DETERMINE THE LOCATION OF A POINT
B C D E F G H POINT TO THE LEFT OF F : POINT E POINT AT THE BOTTOM OF F : POINT B POINT AT THE BACK OF F : POINT G POINT TO THE RIGHT OF D : POINT C POINT ON TOP OF D : POINT H POINT IN FRONT OF D : POINT A

ANGLE BETWEEN A LINE AND A PLANE
C

Orthogonal projection
Activity 3 :To Identify The Angle Between Line And Plane H G The line draw from G and perpendicular to the plane ABCD is call normal Normal E F D C The line lies on the plane ABCD which joint the point A to the line GC is known as the orthogonal projection of line AG on the plane ABCD. Orthogonal projection A B The angle between the line AG and the orthogonal projection, AC is the angle between the line AG and the plane ABCD that is GAC.

Angle between the line AG and the plane ABCD
ACTIVITY 3 : To Identify The Angle Between A Line And A Plane Example 1a H G G A C Normal E F D C At the bottom Name the angle between the line AG and the plane ABCD A B Orthogonal projection Angle between the line AG and the plane ABCD = GAC.

EXAMPLE 1(b) B A C D E H G F Diagram 1(b) Diagram 1b shows a cuboid ABCDEFGH. Name the angle between the line HB and the plane ABCD.

To find the angle between a line and a plane
ACTIVITY 4 : To find the angle between a line and a plane Example 2(a) 5cm B A C D E H G F 4cm 12cm Diagram 2a Diagram 2(a) shows a cuboid, ABCDEFG. Find the angle between the line AH and the plane DCGH.

No Steps Solutions 1. Draw the line AH and shade the plan DCGH in diagram 2a. 12cm H G 5cm E F D C 4cm A B Diagram 2a Diagram 2a shows a cuboid, ABCDEFG. Find the angle between the line AH and the plane DCGH.

No Steeps Solutions 2 Use the method you have learned in activity 3, identify the angle between the line AH and the plane DCGH A H D back 5cm B A C D E H G F 4cm 12cm

No Steps Solutions 3 Refer to the points you have obtained in steep 2 (point A, H, D), complete the ∆ AHD. Mark AHD. Mark the right angle, HDA. Transfer out the ∆ AHD. H A D H 12cm G A H D 5cm E F D C 4cm A B

No Steps Solutions 4 With the information given in the question, label the length of the sides of ∆ AHD. At least the length for 2 sides must be known. Use Pythegoras Theorem if necessary. H 5 cm A D 4 cm H 12cm G 5cm E F D C 4cm A B

No Steps Solutions 6 H Mark, - the opposite side, AD asT
- the adjacent side, HD as S 5 cm S A D 4 cm T 5cm B A C D E H G F 4cm 12cm

6 No Steps Solutions Use the tangent formula to calculate AHD.
Remember, use The sine formula, if O and H were known - The cosine formula, if A and H were known The tangent formula, if O and A Tan AHD = AHD = tan -1 AHD = ’ - SOH – CAH 5cm B A C D E H G F 4cm 12cm – TOA

example 2 (b) 12 cm H G E F 4 cm D C 3 cm A B Diagram 2b Diagram 2b shows a cuboid,ABCDEFGH. Calculate the angle between the line HB and the plane BCGF

ANGLE BETWEEN TWO PLANES

DRAW 3 LINES ACTIVITY 5 : To Identified The Angle Between Two Planes
EXAMPLE 3(a) G H E F D C DRAW 3 LINES A B Diagram 3a Diagram 3a shows a cuboid, ABCDEFGH. Name the angle between the plane AGH and the plane ABCD

ACTIVITY 5 : To Identified The Angle Between Two Planes
Bottom A B Mark the location (direction) of the plane ABCD at the bottom of the first line to the left. Diagram 3a Diagram 3a shows a cuboid, ABCDEFGH. Name the angle between the plane, AGH and the plane, ABCD

ACTIVITY 5 : To Identified The Angle Between Two Planes
Bottom A Refer to the plane, AGH, identify the points which touch the plane, ABCD and write it at the middle line. B Diagram 3a Diagram 3a shows a cuboid, ABCDEFGH. Name the angle between the plane, AGH and the plane, ABCD

ACTIVITY 5 : To Identified The Angle Between Two Planes
H / G A E F D C Bottom Refer to the plane, AGH, identify the point which does not touch the plane, ABCD and write it at the first line to the left. A B Diagram 3a Diagram 3a shows a cuboid, ABCDEFGH. Name the angle between the plane, AGH and the plane, ABCD

ACTIVITY 5 : To Identified The Angle Between Two Planes
H/G A Bottom E F D C Between the point H and G, point which is nearer to point A or located on the same plane as point A will be choosen. Point which is not choosen will be earased. A B Diagram 3a Diagram 3a shows a cuboid, ABCDEFGH. Name the angle between the plane, AGH and the plane, ABCD

ACTIVITY 5 : To Identified The Angle Between Two Planes
Ke Bawah E F D C Between the point H and G, point which is nearer to point A or located on the same plane as point A will be choosen. Point which is not choosen will be earased. A B Diagram 3a Diagram 3a shows a cuboid, ABCDEFGH. Name the angle between the plane, AGH and the plane, ABCD

ACTIVITY 5 : To Identified The Angle Between Two Planes
Bottom E F D C Identify the point which is located at the bottom of the point H ( )and write it on the first line to the right. A B Diagram 3a Diagram 3a shows a cuboid, ABCDEFGH. Name the angle between the plane, AGH and the plane, ABCD

ACTIVITY 5 : To Identified The Angle Between Two Planes
Bottom In the diagram 3a, complete the ∆ HAD and mark the HAD A B Diagram 3a Angle between the plane, AGH and the plane, ABCD = HAD

EXAMPLE 3(b) Diagram 3b E 5cm B A C D H G F 4cm 12cm Diagram 3b shows a cuboid with horizontal rectangle base ABCD. Name the angle between the plane ACH and the plane CDHG

THANK YOU

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