derek2020 derek2020

21-11-2020
Mathematics

contestada

A circle has its centre at the origin and has equation
x + y = 81
What is the size of the radius?

Respuesta :

jimrgrant1 jimrgrant1

21-11-2020

Answer:

radius = 9

Step-by-step explanation:

The equation of the circle centred at the origin is

x² + y² = r² ( where r is the radius )

Given

x² + y² = 81, then

r² = 81 ( take the square root of both sides )

r = [tex]\sqrt{81}[/tex] = 9

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