RCC Structures Design
A part of the slab may be considered as the flange of the T-beam if

It is effectively bonded together with the beam
Flange has adequate reinforcement transverse to beam
It is built integrally with the beam
All of the listed here

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RCC Structures Design
The angle of internal friction of soil mass is the angle whose

Tangent is equal to the rate of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane
Cosine is equal to the ratio of the maximum resistance sliding on any internal inclined plane to the normal pressure acting on the plane
None of these
Sine is equal to the ratio of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane

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