Question

11 The cost of a circular patio, $ C, varies as the square of the radius, r metres. C = 202.80 when r = 2.6 . Calculate the cost of a circular patio with r = 1.8 .

Answer 1

Step-by-step explanation:

Given,

C varies r square.

THEREFORE,

C=K.r square ,where K=non- zero constant.[by variation]

When r=2.6, C=202.80.

Hence,

202.80=K.(2.6)whole square

K=30

Now,when r=1.8

C=30×(1.8)×(1.8). [here,K=30]

C=97.2