-:Triangles:-
(Basic-Propotionality Theorem) OR (Thale's Theorem)
Two triangles are similar, if
1.their corresponding angles are equal and
2.their corresponding sides are proportional
-: Trigonometry:-
Trigonometric-Ratios of 0°,30°,45°,60°,90°
Trigonometric-Ratios of Complementary Angles
-: Coordinate Geometry:-
Distance Formula
Section Formula
Midpoint Formula
Centroid of a Triangle
-: Circles:-
Theorems :
-:Area Related to Circles:-
Formulae on Area of circle, sector and segments
-: Surface Area and Volume:-
-:Statistics & Probability:-
Three measures of central tendency are useful for analysing the data, namely
(a) Mean
(b) Median
(c) Mode
Mean of Grouped data
To calculate the mean of grouped data, we have following three methods
- Direct method
- Assumed mean method
- Step deviation method
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