Question

The perimeter of this quarter circle with radius, r= 23mm.
Give your answer rounded to 1 DP.

Answer 1

82.1

Explanation:

So the circumference of the whole circle is 46π.

A quarter of that is 11.5π.

11.5π ≈ 36.1283155163

Simplify that to 1 decimal point: 36.1

Then you add 46 to that.

36.1 + 46 = 82.1