Question

the shape of the topof a table is that asector of a circle with center O AOB =90.if AO=OB=42cm.find the perimeter

Answer 1

Explain various dimensions of development. Discuss the role of family, teacher and

media in growth and development of a child?

Answer 2

In triangle AOB

Angle AOB = 90 deg
and 
AO = OB = 42 Cm
So 
we can say that the triangle is an isosceles Triangle 

Thus 

angle A = Angle B
Thus

2 Angle A = 180 - 90
   Angle A = Angle B = 45 deg
Thus in triangle AOB
Sin 45 = OA/AB
 Thus   AB = 42 root 2
Thus the perimeter of the top of table = AO + OB +AB
                                                            = 84 + 42 root2
                                                            = 42 ( 2 +  ro