1.

Let ABC be a triangle in which the line joining the circumecentre and incentre is parallel to base BC of the triangle. Then answer the following questions : If angleA=60^(@), then Delta ABC is

Answer»

isoceles
right angled
right angled ISOSCELES
EQUILATERAL

Solution :`because (R )/(R )=cos A =(1)/(2)`
`because A = 60^(@)` but `(r )/(R )LE (1)/(2)` in any `Delta ABC`
Hence, `Delta` is equilateral


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