Answer:
C
Step-by-step explanation:
circumference : 42 π cm
the equation to solve for circumference is : 2
π
r or dπ
radius : 42π
/2π = 21 cm
diameter is r*2
diameter : 21*2 = 42 cm
to find the arc of 90 degrees, divide the circumference by 4
42/4 = 10.5π cm
by process of elimination, C shows
diameter: 42 cm
radius: 21 cm
and arc of 90 degrees: 10.5 π
therefore, C is the correct answer
i hope this helps!
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