If The Radius Of A Circle Is 21 Cm. Find Its Area And Circumference. A. 152 Cm…

If the radius of a circle is 21 cm. Find its area and circumference.
A. 152 cm
B. 132 cm
C. 142 cm
D. 122 cm​

Given:

r = 21 cm

Answer:

I think its looking for the circumference so its B.132 cm.

Solution:

Area of the circle;

A=πr2

  = (π) x (21²)

  ≈1385.44

Circumference;

C=2πr

  = 2 (π) (r)

  = 2 (π) (21)

  ≈131.95

AREA AND CIRCUMFERENCE OF CIRCLE

If the radius of a circle is 21 cm. Find its area and circumference.

SOLUTION:

• [tex]\sf Radius = 21\: cm[/tex]

[tex]\sf Area, A = π × r²[/tex]

[tex]\quad[/tex][tex]\sf A = \frac{22}{7} × 21 × 21[/tex]

[tex]\quad[/tex][tex]\begin{gathered}{\blue{\boxed{\sf{\purple {A = 1386\:cm²}}}}}\end{gathered}[/tex]

[tex]\sf Circumference, C = πr[/tex]

[tex]\quad[/tex][tex]\sf C = 2 × \frac{22}{7} × 21 [/tex]

[tex]\quad[/tex][tex]\begin{gathered}{\blue{\boxed{\sf{\purple {C = 132\:cm}}}}}\end{gathered}[/tex]

FINAL ANSWER:

Therefore, the correct Answer is 132 cm (option B)

[tex]\\[/tex]

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