Step-by-step explanation:
Q1. diameter =90yd radius=45
circumference of circle=2×pi×radius
"" =2×3.14×45
=282.6 yd
Q2 diameter =18m radius=9
area of circle=pi×(radius)
""" =3.14×9²
""" =254.34m²
Divide the first equation by 2:

Sum the two equations:

Divide both sides by 5:

Substitute this value for x in one of the equation (for example the first) and solve for y:

4/6
= (4/2) / (6/2) (divide both numerator and denominator by 2)
= 2/3
The final answer is 2/3~