Quick questions on Circles and their equations - ACT Mathematics

3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is q1?

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A circle has diameter 14. Find its circumference in terms of

\pi

. [1 point]

What is q2?

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Find the centre and radius of

(x - 2)^{2} + (y - 5)^{2} = 16

. [1 point]

What is sign error in the centre?

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The centre is

(h, k)

where

x - h

and

y - k

vanish, so

(x + 1)^{2}

gives

h = -1

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