Mathematic Shape and Space

SHAPE AND SPACE


1. Area of rectangle = length x width
2. Area of triangle = 1/2 base x height
3. Area of parallelogram = base x height
4. Area of trapezium = 1/2 x sum of parallel sides x height
5. Circumference of circle = π d = 2 π r
6. Area of circle = πr2
7. Curved surface area of cylinder = 2πrh
8. Surface area of sphere = 4πr2
9. Volume of right prism = cross sectional area x length
10. Volume of cuboid = length x width x height
11. Volume of cylinder = πr2h
12. Volume of cone = 1/3 πr2h
13. Volume of sphere = 4/3 πr3
14. Volume of right pyramid = 1/3 x base area x height
15. Sum of interior angles of polygon = (n-2) x180o
16. arc leght / circumfere nce of circle = angle subtended at centre / 360o
17. area of sector/circumfere nce of circle = angle subtended at centre / 360o
18. Scale factor , k = PA'/PA
19. Area of image = k2 x area of object