If △ABC is an equilateral triangle and D,E,F are midpoints of BC,CA,AB respectively, then △DEF is:
In right △ABC (right angled at B ), if P and Q are points on AB and BC, then AQ2+CP2= :
If the side BC of △ABC is produced to D, the bisectors of ∠ABC and ∠ACD meet at E. Then ∠BEC is:
The line joining the midpoints of two sides of a triangle is ____ the third side.
In an isosceles triangle ABC with AB=AC,D and E are points on BC such that BE=CD. Then:
If AB=QR,BC=PR and CA=PQ, then:
In △ABC, if ∠B=30° and ∠C=80°, and the bisector of ∠A meets BC at D, then ∠ADB is:
The sum of the distances of any point in the interior of a triangle from its vertices is ____ the semi-perimeter.
In △ABC, the bisectors of ∠B and ∠C meet at O. Then ∠BOC is:
If D is a point on the side BC of △ABC such that AD>AC, then:
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