Some technical terms to know about
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Some technical terms to know about. Angle between two lines. B. Angle between a line and a plane. C.Intersection of two planes. D.Angle between two planes. E.A line of greatest slope. A. Angle between two lines. Whenever ambiguous, always refer to the acute angle.

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Some technical terms to know about

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Some technical terms to know about

Some technical terms to know about

Angle between two lines.

B. Angle between a line and a plane.

C.Intersection of two planes.

D.Angle between two planes.

E.A line of greatest slope.


Some technical terms to know about

A. Angle between two lines

Whenever ambiguous, always refer to the acute angle.


Some technical terms to know about

B.Angle between a line and a plane

  • A’ is the projection of the point A onto the plane  if AA’ is perpendicular to 

A

A’


Some technical terms to know about

D.Angle between a plane and a line

  • Line segment A’B’is the projection of A on the plane 

B

A

A’

B’


Some technical terms to know about

B.Angle between a line and a plane

  • If the line AB intersects the line at A, then we say that B’ is the projection of B on  and AB is the line of projection

B

A

B’


Some technical terms to know about

B.A line and a plane(2)

(a)If the line is parallel to the plane, we cannot find the point of intersection

L


Some technical terms to know about

B.A line and a plane(3)

(b) A normal of a plane is a line perpendicular to every line lying on the plane

L

L1

L2

L3


Some technical terms to know about

B.A line and a plane(1)

(c)If a line is not parallel to the plane, then we can find the point of intersection.

L


Some technical terms to know about

B. Angle between a line and a plane

  • QN is a perpendicular to the plane ABCD.

  • PN is the projection of

  • PQ on the plane ABCD

  • is the angle between

  • the line PQ and the

  • plane ABCD.


Some technical terms to know about

C.Angle between 2 planes(1)

Eg. Two walls which are

opposite to each other

(a)Two parallel planes

1

2


Some technical terms to know about

C.Angle between two planes(2)

(b)Line of intersection of the planes

1

E.g.

2


Some technical terms to know about

C. Angle between two planes

Find the line of intersection.

Construct two lines which lie on the planes such that both of them are perpendicular to the line of intersection

Can you now define the angle between two planes?


Some technical terms to know about

A

B

E. Line of greatest slope

  • If a horizontal plane which intersects an inclined plane ( ) at AB and L is a line on , L is the line of greatest slope on  if L is perpendicular to AB.

L


Some technical terms to know about

E. Line of greatest slope

  • In the figure , XYABand XYCD are two intersecting planes which XYCD is inclined and XYAB is horizontal , PQ is a line on XYCD and perpendicular to XY。

  • Notice that  > 

  • The angle between the line of greatest slope and the horizontal plane is also the angle between the planes


Some technical terms to know about

Q

D

C

B

R

P

X

Y

E. Line of greatest slope

A


Some technical terms to know about

D

N

A

B

O

Find the angle between OB and ABCD.

What is the projection of OB on the plane ABCD?

What is the angle between OB and ABCD?

C


Some technical terms to know about

O

D

N

M

A

Find the angle between ON and plane OBC

What is the projection of ON and plane OBC?

What is the required angle?

C

B


Some technical terms to know about

D

N

A

B

O

Find the angle between planes OBC and ABCD

What is the line of intersection?

Draw a line on the plane OBC and ⊥BC

Draw a line on the plane ABCD and ⊥ BC.

C

M

What is the required angle?


Some technical terms to know about

O

D

N

M

A

Find the angle between planes ONB and ONM

What is the line of intersection?

Draw a line on ONB and ⊥ON

C

Draw a line on ONM and ⊥ON

B

What is the required angle?


Some technical terms to know about

O

D

N

M

A

Angle between planes OAB and OBC

What is the line of intersection?

Draw a line on OAB and⊥OB

Draw a line on OBC and ⊥OB

C

What is the required angle?

B


Some technical terms to know about

The End


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