Plane angle
- 3. PLANE What is a plane? A plane is a flat surface.
- 4. θ A plane angle is two dimensional. The two dimensional shape has only two measurements i.e., length and breadth.
- 6. PLANE ANGLE What is plane angle? Plane angle is the intersection of two straight lines or intersection of two planes. θ θ
- 7. The SI unit of plane angle is ‘radian’ and is denoted as ‘rad’. r s r = s What is radian? Radian is the angle subtended at the centre of a circle by an arc whose length is equal to radius of the circle.
- 8. SOLID ANGLE
- 9. Solid angle is the angle formed by three or more planes intersecting at a common point. An angle formed at the vertex of the cone is solid angle. What is solid angle?
- 10. Solid angle is three dimensional. A three dimensional shape has three measurements such as length, breadth and height. Examples: CUBE CUBOID SPHERE
- 11. The SI unit of solid angle is ‘steradian’ and is denoted as ‘sr’ = 5cm Surface area r2 25cm2
- 12. What is steradian? Steradian is the solid angle at the centre of a sphere subtended by a portion whose surface area is equal to the square of its radius of the sphere. 1 steradian Radius 1m Surface 1m2
- 13. PLANE ANGLE SOLID ANGLE Angle between the intersection of two lines or planes Angle between the intersection of three or more planes at a common point It is two dimensional It is three dimensional Unit is radian Unit is steradian DIFFERENCES BETWEEN PLANE ANGLE AND SOLID ANGLE
- 14. ASSIGNMENT •WHAT IS PLANE ANGLE? •WHAT IS THE SI UNIT OF PLANE ANGLE? •WHAT IS SOLID ANGLE? •DEFINE STERADIAN? •WHAT ARE THE DIFFERENCES BETWEEN PLANE ANGLE AND SOLID ANGLE?