direct , indirect proportionals working models for sales contact 9677551115 - (Ramnad Saravanan)

additive, multiplicative inverse working model - for sale contact 9677551115 -(Ramnad Saravanan)

types of angles working model - for sales contact 9677551115 - (Ramnad Saravanan)

pythagoras theorem working model - (Ramnad Saravanan) for sales contact 9677551115