Identifying 'Saheli'. 'Saheli', known generically as Centchroman, is a non-steroidal oral contraceptive developed by the Central Drug Research Institute (CDRI) in India. Unlike typical hormonal contraceptives that contain estrogen or progestin, Saheli works by blocking estrogen receptors in the uterus, thus preventing the implantation of the egg without the side effects associated with steroid-based pills.
The percentage error in the measurement of mass and velocity are 3% and 4% respectively. The percentage error in the measurement of kinetic energy is:
If \( L, M, N \) are the midpoints of the sides PQ, QR, and RP of triangle \( \Delta PQR \), then \( \overline{QM} + \overline{LN} + \overline{ML} + \overline{RN} - \overline{MN} - \overline{QL} = \):