Question

A number y is diminished by 10​

Answer 1

Answer:

If the radius is diminished by 10% then its area is diminished by how much?

Let the radius of a circle be r.

Area of circle = πr2

If radius is diminished by 10 then,

New radius

=r−r10100

=r−r10

=10r−r10

=9r10

New area = π(9r10)2=π81r2100

Difference of areas

=πr2−π81r2100

=π[(100r2−81r2)100]

=19πr2100

Area is diminished by =19πr2100

Percentage decrease

=[19πr2100÷πr2]×100

=19πr2100πr2×100

=19100×100

=19

Therefore the area is decreased by 19 if the radius of a circle is decreased by 10

Step-by-step explanation:

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Answer 2

a number y is diminished by 10 is the unknown number is 20 since answer y=20