## S-8-30-The nth  term and the sum of first n terms of an A.P are respectively are  Tn and Sn and (Sm /Sn )= (m²/n²) prove that(Tm /Tn = 2m-1/2n-1 )

The nth  term and the sum of first n terms of an A.P are respectively are  Tn and Sn and (Sm /Sn )= (m²/n²) prove that(Tm /Tn = 2m-1/2n-1 ) Or Find the sum of first 40 positive integers divisible by Read More …

## S-8-29-A metallic right circular cone 20 cm high and whose vertical angle is 60° is cut into two parts at the middle of its height by a plane parallel to its base. Find the volume of the frustum so obtained.

A metallic right circular cone 20 cm high and whose vertical angle is 60° is cut into two parts at the middle of its height by a plane parallel to its base. Find the volume of the frustum so obtained.

## S-8-28-The angle of elevation of a cloud from a point 60 m above a lake is 30° and the angle of depression of the reflection of the cloud in the lake is 60°. Find the height of the cloud.

The angle of elevation of a cloud from a point 60 m above a lake is 30o and the angle of depression of the reflection of the cloud in the lake is 60°. Find the height of the cloud.

## S-8-27-Find the area of the shaded region in fig-5, where ABCD is a square of side 20cm.

Find the area of the shaded region in fig-5, where ABCD is a square of side 20cm.

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