There is a mistake in Q.16 of exercise 9.2:
How is the (m-1)th term=a+(m-1)d? Shouldn't it be a+(m-2)d?
AB is a liner segment, and P is its midpoint.D and E are points on the some side of AB such that angleBAD=angleABE and angleEPA=angleDPB show that A)tringleDAP=~TRINGLE AD=BE
the area of rectangle get reduced by 80 units if its length increased by 5 units