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18/08/2026

Class 12 || Three Dimensional Geometry Ex:-11.2 || Question no.1 Show that the three lines with direction cosines 12/13, -3/13, -4/13; 4/13, 12/13, 3/13; 3/13, -4/13, 12/13 are mutually perpendicular.
https://youtu.be/zEGYFXri1fo

18/08/2026

Class 10 || statistics Ex:-13.1 || Question no.6 The table below shows the daily expenditure on food of 25 households in a locality.
Find the mean daily expenditure on food by a suitable method.
https://youtu.be/Hnhz18adMmU

17/08/2026

Class 12 || Three Dimensional Geometry Ex:-11.1 || Question no.5 Find the direction cosines of the sides of the triangle whose vertices are (3, 5, -4), (-1, 1, 2) and (-5, -5, 2).
https://youtu.be/LjX7VrRUyaI

16/08/2026

Class 10 || statistics Ex:-13.1 || Question no.5 In a retail market, fruit vendors were selling mangoes kept in packing boxes. These boxes contained varying number of mangoes. The following was the distribution of mangoes according to the number of boxes.
https://youtu.be/oSWj4k_wop0

16/08/2026

Class 12 || Three Dimensional Geometry Ex:-11.1 || Question no.4 Show that the points (2, 3, 4), (-1, -2, 1), (5, 8, 7) are collinear.
https://youtu.be/qIGMisweGc4

16/08/2026

Class 10 || statistics Ex:-13.1 || Question no.4 Thirty women were examined in a hospital by a doctor and the number of heartbeats per minute were recorded and summarised as follows. Find the mean heartbeats per minute for these women, choosing a suitable method.
https://youtu.be/2xWYIrr_G28

15/08/2026

Class 12 || Three Dimensional Geometry Ex:-11.1 || Question no.3 If a line has the direction ratios -18, 12, -4, then what are its direction cosines?
https://youtu.be/f_o3tEK7boY

13/08/2026

Class 12 || Three Dimensional Geometry Ex:-11.1 || Question no.1 If a line makes angles 90°, 135°, 45° with the x, y and z-axes respectively, find its direction cosines.

Question no.2 Find the direction cosines of a line which makes equal angles with the coordinate axes.
https://youtu.be/76PBEqZX6Q0

13/08/2026

Class 10 || statistics Ex:-13.1 || Question no.3 The following distribution shows the daily pocket allowance of children of a locality. The mean pocket allowance is 18. Find the missing frequency f.
https://youtu.be/C5DsC1aP-iI

12/08/2026

Class 10 || statistics Ex:-13.1 || Question no.2 Consider the following distribution of daily wages of 50 workers of a factory.
Find the mean daily wages of the workers of the factory by using an appropriate method.
https://youtu.be/gfV2rsMawFk

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