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If the circumradius of an equilateral triangle be 10 cm then...

This question belongs to Arithmetic Ability Triangles
Triangles
?

If the circumradius of an equilateral triangle be 10 cm, then the measure of its in-radius is

Answer & Solution
Correct Answer: Option A
According to question,
Circumradius of an equilateral triangle
IR = 10 cm
AO = IR = 10 cm
DO = Ir = ?
Triangles mcq solution image
2 units → 10 cm
1 unit → 5 cm
∴ DO = Ir = 5 cm
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