EQL triangle

Calculate inradius and circumradius of equilateral triangle with side a=77 cm.

Correct result:

r1 =  22.2 cm
r2 =  44.5 cm

Solution:

 tan⁡30∘=r1772 r1=772tan⁡30∘=22.2 cm
 cos⁡30∘=772r2 r2=772/cos⁡30∘=44.5 cm

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