Q19
If the circumradius of an equilateral triangle be 10 cm, then the measure of its in-radius is
A.
5 cm
AnswerB.
10 cm
C.
20 cm
D.
15 cm
Answer: Option A
Solution
Answer: Option A
Solution:
According to question,Circumradius of an equilateral triangle
IR = 10 cm
AO = IR = 10 cm
DO = Ir = ?
2 units → 10 cm
1 unit → 5 cm
∴ DO = Ir = 5 cm