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If a circle has an area of 84π units then what is the measure of its
radius in exact units?
a. 2√21 units
b. √ 54 units
C 10.4 units
d. 108 units

Answer quickly please

If a circle has an area of 84π units then what is the measure of its radius in exact units a 221 units b 54 units C 104 units d 108 units Answer quickly please class=

Respuesta :

  • Answer:

a. 2√21 units

  • Step-by-step explanation:

Hi there !

Area formula

A = π·r²

  • replace A

84π = πr²

r² = 84π/π

r² = 84

r² = 2²×3×7

r = √2²×3×7

r = 2√3×7

r = 2√21

Good luck !