In a ?ABC, ∠A + ∠B = 75° and ∠B + ∠C = 140°, then ∠B is
?ABC is similar to ?DEF is area of ?ABC is 9 sq.cm. and area of ?DEF is 16 sq.cm. and BC = 2.1 cm. Then the length of EF will be
A chord of a circle is equal to its radius. The angle subtended by this chord at a point on the circumference is
Let two chords AB and AC of the larger circle touch the smaller circle having the same centre at X and Y. Then XY =?
Let G be the centroid of the equilateral triangle ABC of perimeter 24 cm. Then the length of AG is
A and B are the centres of two circles with radii 11 cm and 6 cm respectively. A common tangent touches these circles at O & D respectively. If AB = 13 cm, then the length of OD is
ABC is an isosceles triangle inscribed in a circle. If AB = AC = 12√5 and BC = 24 cm then radius of circle is
ABC is an isosceles triangle where AB = AC which is circumscribed about a circle. If P is the point where the circle touches the side BC, then which of the following is true?
BP = PC
BP > PC
BP < PC
BP = 1/2 PC
If D and E are the midpoints of AB and AC respectively of ?ABC, then the ratio of the areas of ?ADE and BCED is?
1 : 2
2 : 3
1 : 4
1 : 3
O is the circumcenter of the isosceles ?ABC. Given that AB = AC = 17 cm and BC = 6 cm, the radius of the circle is